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Topic: R Hydrae

	R Hydrae - Wikipedia
		R Hydrae ist ein veränderlicher Stern vom Typ Mira im Ostteil des Sternbildes Wasserschlange.
		Die Helligkeit von R Hydrae schwankt mit einer Periode, die zur Zeit 389 Tage beträgt, zwischen +3,21 und +11,00
		Die Periode von R Hydrae verändert sich langsam.
	de.wikipedia.org /wiki/R_Hydrae (116 words)

	HYDRA - LoveToKnow Article on HYDRA (Site not responding. Last check: 2007-11-05)
		HYDRA (watersnake), in Greek legend, the offspring of Typhon and Echidna, a gigantic monster with nine heads (the number is variously given), the centre one being immortal.
		The generally accepted interpretation of the legend is that the hydra denotes the damp, swampy ground of Lerna with its numerous springs (K~tiaXaL, heads); its poison the miasmic vapours rising from the stagnant water; its death at the hands of Heracles the introduction of the culture and consequent purification of the soil (Preller).
		HYDRA, in astronomy, a constellation of the southern hemisphere, mentioned by Eudoxus (4th century n.e.) and Aratus (3rd century Bc.), and catalogued by Ptolemy (27 stars), Tycho Brahe (19) and Hevelius (31).
	www.1911encyclopedia.com /H/HY/HYDRA.htm (2394 words)

	AAVSO: Variable Star of the Month, R Hydrae
		The variable star R Hydrae has the distinction of being the third Mira-type variable to be discovered, falling in behind omircon Ceti (also known as Mira, which is the prototype of the class) found in 1596 and chi Cygni found in 1686.
		R Hya is, in fact, known for its declining period.
		The century of steady decrease in R Hydrae's period is consistent with theoretical calculations of what should happen to a pulsating red giant after the sudden ignition of helium near its core.
	www.aavso.org /vstar/vsots/0502.shtml (2481 words)

	The Salopian Web - Constellations: Hydra
		Hydra is the largest and longest of all the constellations and occupies a rather sparse region of the sky.
		In ancient mythology, the Hydra is often associated with the legend of Corvus and Crater.
		The Hydra was an enormous water snake having seven heads which lived in the swamps of Lerna and attacked the people of nearby Argos.
	www.r-clarke.org.uk /constellations/hydra.htm (226 words)

	AllRefer.com - Hydra, in astronomy, Constellation (Constellations) - Encyclopedia
		Hydra, in astronomy, southern constellation lying S of Corvus, Crater, Virgo, Leo, and Cancer.
		The only bright star in the constellation is Alphard (Alpha Hydrae); it is a double star, but the two components can be detected only with a telescope.
		Hydra reaches its highest point in the evening sky in the spring.
	reference.allrefer.com /encyclopedia/H/Hydra-ast.html (196 words)

	Hydra (constellation) - Wikipedia, the free encyclopedia
		The constellation Hydra resembles a twisting snake, and features as such in some Greek myths.
		The origin of this story is likely to be the juxtaposition of this constellation with those of Crater, and Corvus, in the area of the sky known as the Sea.
		The Hydra was also considered to be the Lernaean Hydra (as defeated by Heracles for one of his Twelve Labours) by the Greeks.
	www.wikipedia.org /wiki/Hydra_(constellation) (486 words)

	Encyclopedia: Hydra (constellation) (Site not responding. Last check: 2007-11-05)
		Monoceros (Latin for Unicorn) is a faint constellation on the winter night sky, surrounded by Orion to the west, Gemini to the north, Canis Major to the south and Hydra to the east.
		Hydrus (Latin for Hydra, also referred to as male Hydra or little Hydra) is a minor southern constellation.
		A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7.
	www.nationmaster.com /encyclopedia/Hydra-(constellation) (3389 words)

	Hydra
		As a constellation Hydra sinuously winds down from the northern hemisphere, bordering Cancer, to as far in the southern hemisphere as Centaurus, stretching out to around one hundred degrees in the process.
		Hydrae is a binary of two similar stars (5.8, 5.8) with an even more rapid orbit.
		R Hydrae ranges from a visual magnitude of a fairly bright 3.5 to a faint 10.9 every 388.87 days.
	www.dibonsmith.com /hya_con.htm (1581 words)

	AAVSO: Variable Star of the Month, R Leo
		R Leonis boldly boasts to be one the brightest and easiest to observe variable stars in the sky.
		R Leo was the fifth variable star, and fourth long period variable star to be discovered.
		R has always been a favorite star of mine, for it was the first variable I ever found.
	www.aavso.org /vstar/vsotm/0401.stm (2548 words)

	Further investigations of R Aquilae
		R Aquilae was discovered to be variable in 1856 at Bonn in Germany.
		R Aquilae's light curve is well represented by a sine wave of one period: hence multiple periodicity depicts variation in that period, and not harmonic and/or other, more complex, contemporaneous periodicities.
		R Aquilae is a Mira star of declining period, furthermore the decline is fairly well organised (thereby probably reflecting specific physical processes within the star), quite steady (suggesting an inherent resistance to disruption) and persistent (thus likely to be to be reflecting real processes rather than just suffering from a temporally local stochastic variation).
	www.britastro.org /vss/00012b.html (8495 words)

	R Leonis
		A Mira star, 390 light-years away in the constellation Leo, that is one the brightest and easiest to observe variable stars in the sky.
		Discovered by J. Koch of Danzig in 1782, R Leonis was the fifth variable star, and fourth long-period variable to be found after Mira itself, Chi Cygni, and R Hydrae.
		It may be a result of non-radial pulsations (the star not pulsating equally in all directions) or it may be an optical illusion as a result of large dark spots on the star, perhaps caused by giant convection cells.
	www.daviddarling.info /encyclopedia/R/R_Leonis.html (272 words)

	The Ultimate Hydra (constellation) - American History Information Guide and Reference
		The constellation Hydra resembles a twisting snake [1], and features as such in some Greek myths.
		In Greek mythology, a crow serves Apollo, and is sent to fetch water, but it rests lazily on the journey, and after finally obtaining the water in a cup, takes back a water snake as well, as an excuse.
		The Hydra was also considered to be the Lernaean Hydra (as defeated by Herakles for one of his Twelve Labours) by the Greeks.
	www.historymania.com /american_history/Hydra_constellation (324 words)

	R Hydrae - netlexikon
		R Hydrae ist ein helligkeitsveränderlicher Stern vom Typ Mira im Ostteil des Sternbildes Wasserschlange.
		R Hydrae ist 500 Lichtjahre von der Sonne entfernt und gehört der Spektralklasse M7 IIIe an.
		Untersuchung der Knospenmorphogenese bei Hydra vulgaris PALLAS (Cnidaria, Hydrozoa) von Fernando Pérez
	www.lexikon-definition.de /R-Hydrae.html (193 words)

	Stargazer
		HYDRA: The Water Snake, as this constellation is also known, borders on the constellations of Antlia, Cancer, Canis Minor, Centaurus, Corvus, Crater, Leo, Libra, Monoceros, Puppis, Pyxis, Sextans, and Virgo, and ranks 71
		M48 (NGC-2548; open (galactic) cluster) is located near the western border of Hydra, and has often been regarded as one of the “missing” Messier objects, as no such object exists at the actual coordinates (actually 4 degrees North of the present location of M-48) which Messier charted.
		Hydra also contains the star R-Hydrae, a well-known variable star that was the third of all the long-period variables to be discovered (after Omicron Ceti (Mira) and Chi Cygni).
	www.seanet.com /~folkerts/EASMar01.htm (9590 words)

	Astron. Astrophys. 329, 213-218 (1998) (Site not responding. Last check: 2007-11-05)
		The circumstellar structure of R Hydrae has been investigated in the IRAS survey scan data.
		R Hya is a late M-type Mira variable star whose IRAS LRS spectrum is classified as 15 (no feature).
		R Hya is likely to be experiencing a cessation of mass loss which has lasted for about one hundred years, and which has made the inner boundary of the dust envelope about sixty stellar radii, far from the region which is warm enough to produce the 10
	aa.springer.de /bibs/8329001/2300213/small.htm (270 words)

	Recent Publications
		Percy, R., E.G. Barron and E.M. Sion, A Disk and Photosphere Model Analysis of the Dwarf Nova YZ Cancri in Outburst and Quiescence, Bulletin of the American Astronomical Society, 36#2, 204, 6305, 2004.
		Slevinsky, R., Stys, D., West, S., Sion, E.M., and Cheng, F., A Time-Series IUE Archival Study of the White Dwarf in the Ultrashort Period Dwarf Nova WZ Sagittae, Publications of the Astronomical Society of the Pacific, 111, 1292-1297, 1999.
		Bailey, Allison R., Detecting and Monitoring Phragmites Intrusion in Delaware's Coastal Wetlands: An Evaluation of Subpixel Analysis of Satellite Imagery, (Master's Thesis, University of Delaware) 1997.
	www.delspace.org /publications.htm (10756 words)

	Astrophysics Group - Publications
		R L M Corradi, L Magrini, R Greimel, M Irwin, P Leisy, D J Lennon, A Mampaso, M Perinotto, D L Pollacco, J R Walsh, N A Walton and A A Zijlstra, Astron.
		The case of R Hya is studied in more detail, using archived data and historical records: we find that its period evolved from almost 500 days around its discovery (AD 1662) to about 385 days since AD 1950.
		The Mira variable R Hydrae is well known for its declining period, which Wood and Zarro (1981) attributed to a possible recent thermal pulse.
	jupiter.phy.umist.ac.uk /papers2001.html (19312 words)

	South African Astronomical Observatory: Research papers (Site not responding. Last check: 2007-11-05)
		Rotation periods for stars of the TW Hydrae association : the evidence for two spatially and rotationally distinct pre-main sequence populations.
		Simultaneous optical and X-ray observations of flares and rotational modulation on the RS CVn binary HR 1099 (V711 Tau) from the MUSICOS 1998 campaign.
		Sefako, R., Glass, I.S., Kilkenny, D., De Jager, O.C., Stobie, R.S., O'Donoghue, D., Koen, C., 1999.
	www.saao.ac.za /research/papers/papers.html (9542 words)

	IngentaConnect The evolution of the Mira variable R Hydrae (Site not responding. Last check: 2007-11-05)
		The Mira variable R Hydrae is well known for its declining period, which Wood and Zarro attributed to a possible recent thermal pulse.
		The elapsed time between the mass-loss decline giving rise to the outer detached shell and the recent event, of approximately 5000 yr, suggests that only one of these events could be due to a thermal pulse.
		Further monitoring of R Hya is recommended, as both models make strong predictions for the future period evolution.
	www.ingentaconnect.com /content/bsc/mnr/2002/00000334/00000003/art00002 (480 words)

	Constelaciones más importantes del Hemisferio Sur
		Pese a ser la mayor de las 88 constelaciones, Hydra está lejos de ser conpiscua.
		Hydra era un monstruo de múltiples cabezas al que Hércules dio muerte en uno de sus 12 trabajos.
		Hydra también está relacionada con un cuento moral en el que figura un cuervo que fue enviado a por una copa de agua; el cuervo y la copa corresponden a las constelaciones Corvus y Cráter, representadas en el dorso de Hydra.
	es.geocities.com /inicio_astronomia/hemisferio_austral.htm (2350 words)

	Gamma Hydrae (Site not responding. Last check: 2007-11-05)
		Twelve degrees due south of this very bright star is gamma Hydrae, the last 'hump' or coil in the serpent Hydra.
		Gamma Hya has an interesting neighbour, R Hydrae, a Mira-like long-period variable: binoculars.
		R Hya has a period of 389 days, when it rises from a faint 10 visual magnitude to a rather bright 3.5 or so.
	www.dibonsmith.com /hya_g.htm (159 words)

	R Centauri - Estrella Variable destacada del Mes :: Sur Astronómico
		Se trata de R Centauri, una estrella fácil de localizar dado que está en el mismo campo que alfa y beta Centauri.
		Actualmente R Centauri varía entre magnitudes visuales 6.2 y 9.0 con un período de 505-510 días.
		Llegado un momento el período probablemente se estabilice como sucedió con R Hydrae en 1937.
	www.surastronomico.com /variable_200404.htm (748 words)

	Comparing 1925, 1975, and 1997 (Site not responding. Last check: 2007-11-05)
		Note that the histogram shows relative proportions in each year, but that the years do not scale to each other because they represent different totals - ten times as many objects being observed in 1997 as were observed in 1925.
		In 1925, 48 of the 57 variables were mira stars, 5 were semiregular, 3 were UGSS, and only one RCB (R Coronae Borealis itself) made up the programme.
		Mira itself (omicron Ceti) is on all three sky distribution diagrams (2h19m -3°) also R Hydrae (13h30m -23°).
	www.britastro.com /vss/cmpyears.html (616 words)

	[No title]
		Hercules brought his nephew R Hydrae This was the Iolaus to assist him in the task third long period variable to In ancient Mesopotamia, it of killing the Hydra.
		When these misnomer) is more heavily g r a i n s h i t t h e e a r t h ' s cratered than the near side.
		This is a and is very bright (8.5), large e l o n g a t e d g a l a x y o f bright, s m a l l, and elongated.
	www.amateurastronomy.org /EH/Jan00.txt (2107 words)

	R Hydrae (Site not responding. Last check: 2007-11-05)
		R Hydrae has a distant companion of mag 12 or 13 at PA 324 deg, separation 21.2".
		The pair, assigned Ho 381 or ADS 8920, exhibits common proper motion, and therefore is likely to be a physical pair.
		R Hydrae was Variable Star of the month May 2002 at AAVSO
	www.seds.org /~spider/spider/Vars/rHya.html (137 words)

	Watch this space: A star is torn (Site not responding. Last check: 2007-11-05)
		How this end-game begins is not yet understood, since it happens so quickly and few stars are caught in the act.
		V Hydrae appears to be such a star.
		As V Hydrae is close to us, in cosmic terms, it should provide a convenient window into this short-lived stage of stellar evolution, and an ideal test of theoretical models for the production of jet-like outflows.
	www.nature.com /nature/links/031120/031120-5.html (183 words)

	Giacomo F. Maraldi (Site not responding. Last check: 2007-11-05)
		His most famous astronomical discovery was that the ice caps on Mars are not exactly on the rotational poles of that body.
		He also recognized that the corona visible during a solar eclipse belongs to the Sun not to the Moon, and he discovered R Hydrae as a variable star.
		He also helped with the survey based on the Paris Meridian.
	www.encyclopedia-1.com /g/gi/giacomo_f__maraldi.html (191 words)

	The Constellation Hydra
		The longest of all constellations, spanning 100 degrees from east to west.
		Except for the pentagonal shape that forms the Hydra's head, much of the constellation is located in the skies of the Southern Hemisphere.
		The Hydra's existence has been known for thousands of years, with records noting its snake-like appearance found in ancient Babylonian star charts.
	spaceinfo.jaxa.jp /db/utyu/seiza/seiza_e/umihebiza_e.html (96 words)

	Publications Group, SAO 2002 Bibliography (Site not responding. Last check: 2007-11-05)
		Hynes, R. I., Clark, J. S., Barsukova, E. A., Callanan, P. Charles, P. A., Collier Cameron, A., Fabrika, S. N., Garcia, M. R., Haswell, C. A., Horne, K., Miroshnichenko, A., Negueruela, I., Reig, P., Welsh, W. and Witherick, D. "Spectroscopic Observations of the Candidate sgB[e]/X-Ray Binary CL Camelopardalis." Astronomy and Astrophysics 392 (2002): 991-1013.
		Remillard, R. A., Sobczak, G. J., Muno, M. P., and McClintock, J. "Characterizing the Quasi-Periodic Oscillation Behavior of the X-Ray Nova XTE J1550-564." Astrophysical Journal 564 (2002): 962-973.
		Strachan, L., Suleiman, R., Panasyuk, A. V., Biesecker, D. A., and Kohl, J. "Empirical Densities, Kinetic Temperatures, and Outflow Velocities in the Equatorial Streamer Belt at Solar Minimum." Astrophysical Journal 571 (2002): 1008-1014.
	cfa-www.harvard.edu /cfa/ep/SAOpub02a.html (15722 words)

	HYDRA - Online Information article about HYDRA
		objects are: the nebula H. 27 Hydrae, a planetary nebula, gaseous and whose See also:
		star; Hydrae, a beautiful triple star, composed of two yellow stars of the 4th and 6th magnitudes, and a See also:
		period (425 days) variable, the range in magnitude being from 4 to 9.7; and U. Hydrae, an irregularly variable, the range in magnitude being 4.5 to 6.
	encyclopedia.jrank.org /HOR_I25/HYDRA.html (202 words)

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