Hydra R star
| Hydra R star [1] R Hydrae | |
|---|---|
| Constellation | Hydra |
| Apparent magnitude (V) | 3.5 - 10.9 (strange light) [2] |
| Variable star type | Mira type variable star (M)[2] |
| Position Epoch: J2000.0[1] | |
| Right ascension (RA,α) | 13h 29m 42.78187s [1] |
| Declination (Dec,δ) | -23° 16′ 52.7747″[1] |
| Red shift | -0.000033[1] |
| Radial velocity (Rv) | -10.00km/s [1] |
| Proper motion (μ) | Right ascension: -57.68 milliseconds / year [1] Declination: 12.86 milliseconds / year [1] |
| Annual parallax (π) | 8.05 +-0.69 milliseconds [1] |
| Distance | 404.97 +-37.97 light-year [note 1] (124.22+-11.65 parsec) [note 1] |
| Physical property | |
| Spectral class | M6-9e [1] |
| The other name | |
| The other name | |
| ■Template (■ notebook ■ commentary )■ Project | |
The Hydra R star (うみへびざあーるせい) is a Mira type variable star in Hydra. The scientific name R Hydrae (as for the abbreviated designation R Hya).
Table of contents
Physical property
I make strange light between 3.5 and 10.9 with a period of 388.87 days [2]. The brightness in the very large minimum changes as well as an other Mira type variable star by a period. The spectral class changes with strange light between M9es from M6e, too [3], but an absorption line of technetium is seen in a spectrum.
It is visual binary and, seeing from the earth, sees the subordinate star with the twelfth class to digression 21 seconds. Because the Mira type variable star has many independent stars, it may be said that it is the binary of the Mira type variable star where there are few R stars.
Introduction method of the Hydra R star
Because 3 is to the immediate east of the gamma star of the star, it is easy to relatively find it. You may look for it in the one which first class star, Spica of Virgo almost wins in due north of the R star from Spica.
Footnote
Explanatory note
- The ^ a b parsec calculates calculation (as for the error, like), light-year than parsec *3.26 than 1/ annual parallax (second). Each effective figure decimal second place
Source
- ^ a b c d e f g h i j k l m n o p "SIMBAD Astronomical Database". Results for R Hya. September 30, 2015 reading.
- ^ a b c "GCVS". Results for R Hya. September 30, 2015 reading.
- It is published by first edition first impression, ISBN 978-4-8052-0789-5, 176 pages on ^ astronomy observation chronological table editing committee meeting "2008 astronomy observation chronological table" ground person book building, November 20, 2007
Outside link
- Page (English) in the association of R Hydrae - AAVSO - United States variable star observer official site
- Celestial map of the Hydra R star of the variable star meeting for the study in Japan
This article is taken from the Japanese Wikipedia Hydra R star
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