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Topic: Absolute Visual Magnitude

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Absolute magnitude

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	Ch08RevAns (Site not responding. Last check: 2007-09-18)
		The absolute magnitude is the magnitude that the stars would have if they were all at a common distance of 10 pc from the observer.
		The absolute visual magnitude is then related to the intrinsic brightness of the star in the visible portion of the electromagnetic spectrum.
		Consequently, the absolute visual magnitude ignores energy in the gamma-ray, x-ray, ultraviolet, infrared, and radio regions that is included in the determination of the star’s luminosity.
	www.snc.edu /physics/takahashi/AstronomyF05/Horizons/Chapter08/Ch08RevAns.html (1552 words)

	What Is Visual Magnitude? (Site not responding. Last check: 2007-09-18)
		"Visual magnitude" is a scale used by astronomers to measure the brightness of a star.
		Absolute magnitude is defined as how bright a star would appear if it were exactly 10 parsecs (about 33 light years) away from Earth.
		Absolute magnitudes are often written with a capital (upper case) "M".
	liftoff.msfc.nasa.gov /academy/universe/MAG.HTML (385 words)

	wikien.info: Main_Page (Site not responding. Last check: 2007-09-18)
		In defining absolute magnitude it is necessary to specify the type of electromagnetic radiation being measured.
		Many stars visible to the naked eye have an absolute magnitude which is capable of casting shadows from a distance of 10 parsecs; Rigel (-7.0), Deneb (-7.2), Naos (-7.3), and Betelgeuse (-5.6).
		In this case, the absolute magnitude is defined as the apparent magnitude that the object would have if it were one astronomical unit (au) from both the Sun and the Earth and at a phase angle of zero degrees.
	www.alanaditescili.net /index.php?title=Absolute_magnitude (553 words)

	Magnitude
		Apparent magnitude is the brightness of an object as it appears to an observer on Earth.
		Visual magnitude is the magnitude measured when using the light to which the human eye responds.
		Photographic magnitude is the magnitude measured by a standard photographic emulsion, which responds chiefly to the blue and violet part of the spectrum (although different photographic materials have very different colour responses).
	www.historyoftheuniverse.com /magnitude.html (618 words)

	Astronomy Answers: AstronomyAnswerBook: Magnitudes (Site not responding. Last check: 2007-09-18)
		A difference of five magnitudes corresponds to a brightness ratio of exactly 100: a star of magnitude 0 is 100 times as bright as a star of magnitude 5, and 10,000 (= 100 times 100) times as bright as a star of magnitude 10.
		The limiting magnitudes are as seen from the Earth: the Hubble Space Telescope in space might gain another 1.5 magnitudes because it does not have to look through an atmosphere that blurs and scatters light.
		The absolute magnitude is the magnitude the object would have if it were at a distance of 10 parsec (32.6 lightyears).
	www.astro.uu.nl /~strous/AA/en/antwoorden/magnituden.html (1812 words)

	Ch08Sum (Site not responding. Last check: 2007-09-18)
		Whereas apparent (visual) magnitude describes how bright a star appears from its true distance, absolute (visual) magnitude describes how bright the same star would look from the arbitrarily chosen standard distance of 10 pc.
		Absolute magnitude is directly related to the intrinsic brightness [actual energy output] of a star and allows a true comparison among stars.
		Apparent magnitude and absolute magnitude are related to each other by the inverse square (distance) relation.
	www.snc.edu /physics/takahashi/AstronomyS05/Horizons/Chapter08/Ch08Sum.html (985 words)

	SETI : Turotial/Measuring Time and Distance
		Absolute brightness tells us how luminous, or bright, a star is; however, we usually see stars at different distances; two stars with equal absolute brightness but at different distances will appear with different apparent brightness; the closer one will appear brighter than the one further away.
		The word "magnitude" could be exchanged for "brightness" in the paragraph above, except "magnitude" is measured in a peculiar way.
		There is a correction factor that takes into account that visual magnitude gives the luminosity in the visible part of the spectrum, while the star also emits at both lower and higher wavelengths.
	www.phy.syr.edu /courses/CCD_NEW/seti/tutorial/measure/part6.html (950 words)

	Magnitude - Scientia Astrophysical Organization
		The absolute magnitude, M, of a star or galaxy is the apparent magnitude it would have if it were 10 parsecs away (1 parsec is around 300,000,000,000,000 kilometres or 32.6 light years).
		Absolute magnitudes of stars generally range from -10 to +17, that means that stars can be very, very different in brightness.
		For an object with a given absolute magnitude, 5 is added to the apparent magnitude for every tenfold increase in the distance to the object.
	www.astrometry.org /magnitude.php (1281 words)

	Brightest Stars
		Any star with a dimmer absolute magnitude is not in the running for brightest star in the Milky Way, and there are quite a few of them.
		Its absolute visual magnitude of -10.6 is the brightest known.
		The bolometric magnitude is the brightness integrated over all wavelengths, while the visual magnitude is the brightness only over visible wavelengths.
	www.tim-thompson.com /bright-stars.html (1004 words)

	What is a nuclear magnitude? (Site not responding. Last check: 2007-09-18)
		For practical purposes, the nuclear magnitude may be defined as the rather sharp condensation of light in the inner coma, and this concept has been adopted by many observers, mainly amateur astronomers.
		Unless the nuclear brightness is much higher than that of the coma, the flux measured in a small disc centered on the brightest peak would have a non-negligible contribution from the coma.
		is the absolute (visual) nuclear magnitude of the comet (the apparent magnitude at 1 AU from the Sun and the Earth and zero phase angle) and
	www.fisica.edu.uy /~gonzalo/catalog/node2.html (424 words)

	JAS: The 25 Brightest Stars
		The absolute visual magnitude: The apparent magnitude a star would have if viewed from a distance of 10 parsecs (1 pc = 3.26 light-years).
		The spectra are from H.L. Johnson and W.W. Morgan; colors and magnitude are photoelectric, V being the equivalent of a visual brightness and B-V blue minus visual color index.
		The absolute visual magnitude Mv are based on measured parallaxes; when only one significant figure is given, however, they are only estimates.
	www.jas.org.jo /bright.html (115 words)

	IMSA Astrophysics: Distance Ladder
		Therefore, if the spectral type can be determined from spectral analysis of the radiation received from the star, then the absolute visual magnitude can be read off from the H-R diagram.
		Since the apparent magnitude is easy to measure, the two pieces of data can be applied to the distance modulus equation to determine a distance.
		In the example above, a star of spectral class A5 from the main sequence is shown to have an absolute magnitude of Mv=1.5.
	staff.imsa.edu /science/astro/astrometry/stellarclass.html (298 words)

	Magnitude Scale
		In his system, the brightest stars were assigned a magnitude of 1, the next brightest magnitude 2 and so on to the faintest stars, just visible to the unaided eye which were magnitude 6.
		The scale for absolute magnitude is the same as that for apparent magnitude, that is a difference of 1 magnitude = 2.512 times difference in brightness.
		In practice this type of problem is less realistic for actual objects as we can normally measure their apparent magnitudes directly however it may be that we wish to calculate what apparent magnitude a class or type of object may have given the other parameters.
	outreach.atnf.csiro.au /education/senior/astrophysics/photometry_magnitude.html (2378 words)

	tut02-1.htm (Site not responding. Last check: 2007-09-18)
		Intrinsic brightness of a star; the apparent visual magnitude the star would have if it were 10 Parsecs away from earth.
		Is the magnitude of the stars without compensating for their distance from Earth.
		A method of determining a star's distance by comparing its apparent magnitude with its absolute magnitude as estimated from its spectrum.
	www.asterism.org /tutorials/tut02-1.htm (7483 words)

	DIVA: Parallax Survey (Site not responding. Last check: 2007-09-18)
		The nearest known stellar neighbour to the sun is a faint red star Proxima Centauri (absolute visual magnitude 15.5 mag.) at a distance of about 1.3 pc.
		DIVA will provide the luminosity function (LF) of field stars based on accurate parallaxes and magnitudes for all stars down to absolute visual magnitude 16 and, consequently, probe the LF maximum presently assumed to be at about 13th absolute visual magnitude.
		DIVA will determine the turn-off points of metal-poor stars on the HRD from complete samples of subdwarfs down to absolute visual magnitude 6.5 and, therefore, contribute to the age determination of the Galaxy.
	www.ari.uni-heidelberg.de /diva/science_parsurvey.html (216 words)

	SCYON: Paper abstracts (Site not responding. Last check: 2007-09-18)
		magnitudes for stars of known metallicity and absolute (visual) magnitude, for application to our study of LMC globular clusters.
		The colour-magnitude diagram shows an apparent second turnoff some 1.5 magnitudes fainter than that of the cluster.
		We show that this is most likely the background Galactic bulge: however, in that case, the colour-magnitude diagram of NGC 6553 is not a good match to that of the field bulge population.
	obswww.unige.ch /webda/scyon/Beaulieu.html (226 words)

	Slazbo Astronomy...Definitions (Site not responding. Last check: 2007-09-18)
		Magnitude an astronomical object would have if it were at a distance of 10 parsecs
		Absolute magnitude of an object measured in terms of the visual range of the human eye
		The absolute magnitude can be calculated from the star's period of variation.
	home.mcn.net /~slazbo/astro/def.html (2510 words)

	PHY103 Stars and Galaxies: Luminosity, Flux and Magnitudes
		The apparent magnitude of the Sun as seen from the Earth is -26.7.
		If the absolute visual magnitudes of the two components are estimated to be 3.8 for the F7 star and 4.8 for the G3, what is the absolute visual magnitude of the unresolved pair?
		Explain what is meant by the terms apparent visual magnitude and absolute visual magnitude, and write down an equation which relates the two.
	www.shef.ac.uk /physics/teaching/phy103/examples1.html (1276 words)

	[No title] (Site not responding. Last check: 2007-09-18)
		A Absolute Bolometeric Magnitude The Absolute Magnitude we would observe if we could detect all wavelengths Absolute Visual Magnitude Intrinsic brightness of a star; the apparent visual magnitude the star would have if it were 10 Parsecs away from earth.
		Distance Modulus The difference between the apparent and absolute magnitude of a star.
		Eyepiece A short focal length lens used to enlarge the image in a telescope; the lens nearest the eye F False Color A graphical representation of data in which an images is colored to reveal additional detail Field A way of explaining action at a distance.
	lacyg.box.sk /glos/astro1 (7567 words)

	Exams and Quizzes (Site not responding. Last check: 2007-09-18)
		Absolute visual magnitude of a star is different from apparent visual magnitude of a star since ___________________________________________________________
		In chapter 2, you learned that the magnitude difference between two stars was related to the ratio of their apparent brightnesses.
		If the magnitude difference is 5, then the stars have a brightness ratio of 100.
	www.harpercollege.edu /tm-ps/ast/101/exam.htm (695 words)

	Cyg OB2 #12 and the Cygnus OB2 Association
		The picture in figure 1, a 15x15 arcminute field from the first Palomar Sky Survey (retrieved from MAST DSS), is centered on the location of Cyg OB2 #12, and demonstrates the affect of the extinction.
		It's there, but it is unspectacular, considering that it's the brightest visual star in the galaxy.
		The absolute bolometric magnitude of Cyg OB2 #12, -12.2, also makes it the most intrinsically luminous star known, in the Milky Way, barring the high temperature model of the Pistol star.
	www.tim-thompson.com /cyg-ob2-12.html (698 words)

	IC 1396
		It is very red colored with a B-V magnitude of 2.5.
		Also called Herschel's Garnet Star, mu Cephi is a variable star that varies in magnitude from 3.4 to 5.1 over a period of approximately 730 days.
		It's absolute visual magnitude is -6.7, 38,000 times brighter than the Sun.
	www.astropix.com /HTML/E_SUM_N/IC1396.HTM (189 words)

	Planet Quest: Glossary (Site not responding. Last check: 2007-09-18)
		The apparent visual magnitude the star would have if it were 10 pc away.
		Produced by the absence of photons because they were absorbed by atoms or molecules.
		Wavelength region in which our atmosphere is transparent - at visual, infrared, and radio wavelengths.
	planetquest.jpl.nasa.gov /glossary/glossary.html (265 words)

	Catalog of Catalog of galactic O-type Stars
		In addition, the authors have included derived values of absolute visual and bolometric magnitudes, and distances.
		Absolute visual magnitude, M(V), taken from the primary source given in r_ID or from Conti's (1975) calibration of spectral type and M(V).
		Absolute bolometric magnitude computed using Conti's (1975) temperature scale and Morton's (1969) bolometric corrections as a function of temperature.
	www.cs.wisc.edu /niagara/data/nasa/2082.xml (815 words)

	How Bright Do Stars Shine (Site not responding. Last check: 2007-09-18)
		janette l gubala Answer: The brightness of stars as seen from the Earth is called "apparent visual magnitude"; it is designinated by "m subscript v" and is a logarithmic scale like the Richter scale used for earthquakes.
		The brightest star seen from the Earth's northern hemisphere is Sirius, the Dog Star with a _m subscript v_ of -1.5 (the stellar magnitude scale is one in which a negative number is brighter than a positive number).
		The absolute visual magnitude, designated by "M subscript v", gives the true brightness: Deneb (alpha Cygnus) has Mv = -6.9, and Rigel (beta Orion) is almost as bright with Mv = -6.8.
	www.newton.dep.anl.gov /askasci/ast99/ast99285.htm (154 words)

	Requirements for (CODES)
		If sufficient visual magnitude observations are available, CODES will also attempt to solve for the best-fit visual brightness parameters (absolute visual magnitude and slope parameter).
		If insufficient visual magnitude observations are available, or if no reasonable best-fit solution can be obtained, CODES will adopt a default value (dependent on whether the minor planet is an asteroid or a comet) for the slope parameter, and derive the resulting absolute visual magnitude
		In the case of an asteroid, the calculated values of absolute visual magnitude and slope parameter will be used to estimate the radius of the minor planet
	home.earthlink.net /~jimbaer1/Requirements_for_CODES.htm (1513 words)

	ASONIC Close Stars (Site not responding. Last check: 2007-09-18)
		Stars that are within 5 parsecs (17.1 ly's) of Earth, and that have an Absolute Visual Magnitude (Mv) of 10.0 or fainter.
		'V' column shows the value of the apparent visual magnitude of the star.
		'Mv' column shows the value of the absolute visual magnitude of the star.
	c3po.cochise.cc.az.us /astro/asonic_nearstar_p.htm (160 words)

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