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Topic: Research Consortium on Nearby Stars

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	RECONS
		The purpose of RECONS is to understand the nature of the Sun's nearest stellar neighbors, both individually and as a population.
		Our goals are to discover ``missing'' members of the sample of stars within 10 parsecs (32.6 light years), and to characterize all stars within that distance limit.
		Characterization includes photometry and spectroscopy at both optical and infrared wavelengths, as well as determinations of the luminosity function, mass function, and multiplicity fraction of the nearby stars.
	www.chara.gsu.edu /RECONS (95 words)

	Stars within 10 parsecs
		The greater the parallax of a star the closer it is to the Earth and Sol, and the smaller its distance in parsecs.
		Hence, the closest star to the Earth will have the largest measured parallax; this belongs to the star Proxima Centauri, which has a parallax of 0.772 arcseconds and thus is located approximately 1.30 parsecs, or 4.22 light-years, away from Sol.
		While there are no bright blue stars of spectral "O" or "B" in the Solar neighborhood, most of the 74 nearby AFGK bright stars have probably been found, although a few dim, late orange-red K-type dwarfs may yet be identified.
	www.solstation.com /stars/pc10.htm (998 words)

	Nearby Stars Database
		The total number of stars expected within 25 pc (scaled from the better-known sample within 5 pc) is roughly 10000 in 5500 systems, indicating that nearly three-quarters of the sample is "missing" (see also section 2 below).
		The defining measurable characteristic of a nearby star is its trigonometric parallax.
		The sample is incomplete in two senses: (1) the density of known stars drops with distance, and (2) a disproportionate number of stars remain unidentified in the southern sky.
	www.nstars.nau.edu /index.cfm?fuseaction=nstars.paper (3258 words)

	[sci.astro] Stars (Astronomy Frequently Asked Questions) (7/9)
		Neutron stars have a maximum mass of around 2 solar masses, although the exact theoretical value depends on properties of the neutron that are not known terribly accurately.
		Stars in the thin disk come in a wide variety of ages, from newborn objects to stars that are 10 billion years old.
		If the axes of the star's rotation and magnetic field are not aligned, this rotating magnetic field produces an electric field; in the case of NSs, the electric fields are strong enough to rip particles from the crust of the NS and accelerate them.
	www.cs.uu.nl /wais/html/na-dir/astronomy/faq/part7.html (7213 words)

	AAS 203rd - Special Sessions (Site not responding. Last check: 2007-09-10)
		The nearest stars have received renewed scrutiny because of their importance to fundamental astrophysics and their potential for harboring planetary systems and life.
		The nearby stars' greatest asset is their proximity, which allows the most detailed studies possible of stellar characteristics, populations, and circumstellar environments.
		Several members of RECONS (Research Consortium on Nearby Stars) will discuss their discoveries that have impacted stellar astronomy in fundamental ways in the last decade.
	www.aas.org /meetings/aas203/prelim/nearby.html (157 words)

	Astronomers discover 20 new stars in Earth's neighbourhood (Site not responding. Last check: 2007-09-10)
		The 20 newly reported objects are all red dwarf stars, which comprise 239 of the 348 known objects beyond our Solar System within the 10-parsec boundary of the RECONS survey, suggesting that red dwarfs likely account for at least 69 per cent of the Milky Way's residents.
		The pool of nearby stars without accurate parallaxes is nowhere near drained," notes Henry.
		The purpose of RECONS survey is to discover and characterise overlooked stars and brown dwarfs in the vicinity the Sun.
	news.webindia123.com /news/articles/World/20061115/508737.html (290 words)

	ESA Portal - AKARI’s view on birth and death of stars
		The dust in the gas is heated by the intense light coming from both the massive star at the centre of the nebula and the newly born stars in the dense gas itself, and emits infrared light.
		Stars with masses close to that of our Sun will expand during the later stages of their life becoming so-called 'red-giant' stars.
		During the final phase of their life such stars often eject gas from their surface into interstellar space - dust is formed in the ejected gas, and this mixture of gas and dust expands and escapes from the star.
	www.esa.int /esaCP/SEM4TU5LARE_index_0.html (762 words)

	New Nearby Objects (within 20 light-years)
		On August 1, 2006, astronomers (led by Edgardo Costa and Rene Mendez of the Universidad de Chile in Santiago) announced that an extremely dim M8.5 red dwarf should be reclassified as the closest known "L-type" brown dwarf in the Solar neighborhood.
		As of March 2006, SCR 1845-6357 may the 36th closest known star to Sol, while its brown dwarf companion "b" is the third closest known brown dwarf.
		In February 2005, astronomer Todd Henry reported that RECONS was able to revise the measurement of the star's visual magnitude to 18.0, about a magnitude brighter than originally estimated (Kenneth Crosswell, 2005).
	www.solstation.com /stars/new-obj.htm (566 words)

	Destination: Alpha Centauri
		The third star of this trinary system is labeled Alpha Centauri C. "C" lies 13,000 AU from both A and B (a distance roughly equivalent to 400 times the distance between our Sun and the eighth planet in our system, Neptune).
		These stars are within the realm for producing the correct amount of heat and light energy to maintain both a long solar life and the right amount of energy to support life over that lifetime.
		Stars that are very young may still be evolving on their own, and thus are not good prospects for colonization while older stars may be cooling, dying, and thus, obviously are also not good candidates for colonization.
	www.goingfaster.com /icarus/destinationalpha.htm (1926 words)

	Centauri Dreams » Blog Archive » A New Set of Nearby Stars
		Contrary to people, older stars like the Jupiter-sized red subdwarfs generally move faster than their younger counterparts that are still hanging around their stellar nurseries, and the two discovered systems are moving about three times faster than even middle aged stars.
		Some data on the star (drawn from Ken Croswell’s Pinpointing a Stellar Neighbor): “The star emits only 0.00015 percent as much visible light as the Sun and, therefore, requires 1,800 years to generate the same amount of light the Sun throws off in a 24-hour day.
		If the star took the Sun’s place, it would look dimmer than the Full Moon.” DENIS 1048-3956 is either a red or a brown dwarf, and a known emitter of radio flares that may be a consequence of its rapid rotation.
	www.centauri-dreams.org /?p=398 (617 words)

	Red dwarf stars within 10 parsecs
		These circular motions also move around the star's material itself, which means that the helium which is created by fusion of hydrogen in the core becomes distributed throughout the star.
		Since this is older than the age of the universe (on the order of 10 billion years), these stars have yet to reach the white dwarf stage (University of Maryland definitions of a red dwarf and a white dwarf).
		Hence, Earth-type life around flare stars may be unlikely because their planets must be located very close to dim red dwarfs to be warmed sufficiently by star light to have liquid water (around 0.04 to 0.07 AU for UV Ceti, when accounting for infrared wavelengths), which makes flares even more dangerous around such stars.
	members.nova.org /~sol/solcom/stars/pc10rds.htm (1595 words)

	Universe Today » Archive » New Stellar Neighbours Found
		The apparent back and forth motion of a nearby star during the year reflects the motion of the Earth around the Sun, much like how your finger appears to jump back and forth in front of your eyes if you blink one eye, then the other.
		From Earth, nearby stars appear to make tiny ellipses in the sky because the Earth does not jump from one side of its orbit to another, but slides smoothly around the Sun.
		The estimated âmissingâ population of solar neighborhood members is expected to be composed primarily of very low mass stars with spectral type M (known as red dwarfs), and objects of spectral types L and T, many of which are actually brown dwarfs with too little mass to start long-term thermonuclear reactions.
	www.universetoday.com /2006/11/14/new-stellar-neighbours-found (934 words)

	Centauri Dreams » Blog Archive » 20 New Nearby Stars Discovered
		Watching the population of nearby stars grow is a chastening exercise.
		The measured separation of the two stars is 0.90 arcseconds; at a distance from Earth of 8.8 parsecs (28.7 light-years) as obtained by RECONS, this equates to 7.9 Astronomical Units between the two, a bit less than the distance between the Sun and planet Saturn.
		The pool of nearby stars without accurate parallaxes is nowhere near drained.” Thus the essential cataloguing continues.
	www.centauri-dreams.org /?p=902 (1062 words)

	List of nearest stars - Wikipedia, the free encyclopedia
		This list of the nearest stars to Earth is ordered by increasing distance out to a maximum of 5 parsecs (16.308 light years).
		The stellar class is shown in the color of the star's spectral classification.
		Structure and Evolution of Nearby Stars with Planets II.
	en.wikipedia.org /wiki/List_of_nearest_stars (189 words)

	[CSI] College of Southern Idaho (Site not responding. Last check: 2007-09-10)
		In cases where the star was not measured directly but is part of a system whose primary was, no range is supplied.
		In cases where the star is part of a system where only the primary was observed, the source catalog name is in parentheses.
		If the difference in the star's position as seen from the Sun as compared to the Earth is 1 arc second (1/3600 degree), its distance is, by definition, 1 parsec.
	www.csi.edu /herrett/staff/cja/cja_stardist.html (413 words)

	[130.01] RECONS Discoveries of New Nearby Stars (Site not responding. Last check: 2007-09-10)
		The nearby stars have gained new respect and interest in recent times because of their importance in such fundamental questions as "What is the nature of the Sun's neighbors?", "Are there planets circling nearby stars?", and "Is there life on any of those planets?"
		The RECONS (Research Consortium on Nearby Stars) effort to discover new solar neighbors via astrometric, photometric, and spectroscopic work will be outlined.
		The entire RECONS sample of stars --- those within 10 pc --- will be outlined in detail, including information about their colors, spectral types, and multiplicity, as well as the comprehensive luminosity and mass functions for the local Galactic population.
	www.aas.org /publications/baas/v33n4/aas199/328.htm (291 words)

	Other stellar astronomy websites (Site not responding. Last check: 2007-09-10)
		NearBy Star Observers is, in the words of its homepage, "An Organization that is active in Observing, Studying and the Exchange of Information of the Nearby Stars within a 20 parsec (65.2 light year) radius of the Sun." Their pages come in English, German, Spanish, and French flavors.
		The Research Consortium on Nearby Stars (RECONS) collects observational data, and has even been responsible for improving the accuracy of the parallax measurements to some of our stellar neighbors.
		Kurt Foge has written a book titled 3-D Star Maps, which seems to have been inspired by the same sorts of ideas that inspired the Internet Stellar Database, and includes instructions on how to build 3D stellaria.
	www.stellar-database.com /links.html (410 words)

	Iran Daily - Science - 11/21/06
		The distances to these stars were measured using what is called a parallax technique, which takes advantage of the simple geometry of Earth’s changing position in the cosmos as it orbits the Sun each year.
		Rutgers researcher Richard H. Ebright and his collaborators have resolved key questions regarding transcription, the fundamental life process that was the subject of the 2006 Nobel Prize in Chemistry, EureKalert said.
		The researchers showed that, during initial transcription, the machine does not move to reach adjacent DNA segments; nor does it stretch to reach adjacent DNA segments (as had been proposed two decades ago in models termed “transient excursions“ and “inchworming“).
	www.iran-daily.com /1385/2713/html/science.htm (2172 words)

	New Georgia Encyclopedia: Astronomy (Site not responding. Last check: 2007-09-10)
		In 1989 several academic institutions with relatively small astronomy departments and with faculty engaged in astronomical research, including UGA and VSU, formed the Southeastern Association for Research in Astronomy (SARA).
		Since the summer of 1995, SARA has provided research experiences for undergraduates who are sponsored by the National Science Foundation.
		GSU currently boasts several advanced astronomical research programs: the Program in Extragalactic Astronomy, which concentrates on the astrophysics of active galactic nuclei; the Research Consortium on Nearby Stars, which seeks to understand the nearest of the sun's neighbors; and the Center for High Angular Resolution Astronomy (CHARA), which analyzes the astrophysical properties of stars.
	www.georgiaencyclopedia.org /nge/Article.jsp?id=h-1196 (841 words)

	AMNH Astrophysics Seminars, past
		New research over the last decade, however, suggests that the K/T event may be the only of the so called "Big Five" mass extinctions to have been impact caused, and now this has led to a revision of the Impact Kill Curve hypothesis.
		We have begun to trace the evolution of the cosmic star formation rate to redshifts when the Universe was only a fraction of its present age and it appears that this cosmic star formation rate increases with lookback time from z=0 to z~1 before flattening out at higher redshifts.
		For stars within 100 pc of the Earth, Jovian mass planets still hot from their recent formation may be directly imaged in the near-infrared at Kuiper belt like distances from their parent stars.
	research.amnh.org /users/lepine/seminars_past.html (9499 words)

	Las estrellas frías de la vecindad solar / Cool stars in the solar Neighborhood, Departamento de Astrofísica (UCM)
		Spectroscopy of Northern NLTT Stars (Cruz, & Reid, 2002, AJ, 123, 2828)
		Optical spectroscopy of high proper motion stars: new M dwarfs within 10 pc and the closest pair of subdwarfs (Reylé C., et al.
		Kinematics and metallicity of stars in the solar region (Eggen O.J., 1998, Astron.
	www.ucm.es /info/Astrof/invest/actividad/cool_NS.html (1603 words)

	SPACE.com -- Nearby Stars Come Out of Hiding
		The just-discovered stars reside within 33 light years of Earth and include the 23rd and 24th closest stars to the Sun.
		The 20 newly reported objects are all red dwarf stars, which now account for 69 percent of the Milky Way’s residents.
		The two stars orbit each other every 50 years or so and are within 7.9 astronomical units (AU) of each other, a bit less than the distance between the Sun and Saturn (1 AU is the distance from Earth to the Sun).
	www.space.com /scienceastronomy/061115_stellar_neighbors.html (596 words)

	Spaceflight Now \| Breaking News \| Twenty new stars in the neighborhood
		With launch of the Upper Atmosphere Research Satellite from space shuttle Discovery in September 1991, a new era in studying Earth's environment from space began.
		A progress report on development of the Orion crew exploration spacecraft and the Ares launch vehicle is given during this briefing held October 18 at the Glenn Research Center in Cleveland.
		RECONS has also found several nearby white dwarfs, which are the burned-out cores of intermediate- mass stars, lurking in the solar neighborhood.
	spaceflightnow.com /news/n0611/14newstars (1423 words)

	Project Solar System
		The armada consisted of one probe from the European Space Agency, two probes that were joint projects between the Soviet Union and France, two probes from the National Space Development Agency of Japan, and a probe from the United States' National Aeronautics and Space Administration.
		Research Consortium on Nearby Stars - The Research Consortium on Nearby Stars (RECONS) is a project to investigate the stars nearest to the Solar System - those within 10 parsecs (32.6 light years).
		As a succinct presentation of the erupting sun, its diverse mix of the pages of current systems of many energy research and project solar system forums and sustainability and is written by an ideal location for quick and components such activities and solar approaches in the detail or lunar bases.
	www.worldwindtech.com /projectsolarsystem.html (806 words)

	Research Consortium on Nearby Stars - Wikipedia, the free encyclopedia
		The Research Consortium on Nearby Stars (RECONS) is a project to investigate the stars nearest to the Solar System - those within 10 parsecs (32.6 light years).
		In part the project hopes a more accurate survey of local star systems will give a better picture of the star systems in the galaxy as a whole.
		In November 2006 RECONS announced they had discovered 20 new star systems within 10 parsecs of the Solar System, in addition to 8 new star systems announced between 2000 and 2005.
	en.wikipedia.org /wiki/Research_Consortium_on_Nearby_Stars (213 words)

	3-D Starmaps:Star Catalogues
		Please note that while they have removed all stars incapable of hosting a human habitable planet, the remaining stars in the database are not guaranteed to have such a planet.
		The stars in the database are those "worthy of a closer look." The HabCat dataset is available here in a Zip archive.
		The Yale Bright Star catalog is a good source for stars that have actual names (i.e., "Polaris" instead of BD+50°1725).
	www.projectrho.com /smap06.html (1225 words)

	NOAO Sky Survey Seeks New Neighbors, Locals Only Need Apply \| SpaceRef Canada - Your Daily Source of Canadian Space News
		When combined with a star's natural linear movement in the sky due to its relative motion as compared to the Sun, a nearby star will trace out a wiggly, snake-like path over the course of observations.
		The length of the observed path is determined by the star's motion relative to background stars.
		All of these new discoveries are small stars of the type astronomers refer to as "red dwarfs" (spectral type M), and they are located in the southern sky, where research on nearby stars has been historically less extensive than in the Northern Hemisphere.
	www.spaceref.ca /news/viewpr.html?pid=3933 (1338 words)

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