101 Virginis
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 17m 28.4519s[1] |
| Declination | +15° 15′ 48.167″[1] |
| Apparent magnitude (V) | 5.84[2] (5.74 - 5.90[3]) |
| Characteristics | |
| Spectral type | M3IIIa[2] |
| B−V color index | 1.678[2] |
| Variable type | SRb[3] |
| Astrometry | |
| Radial velocity (Rv) | −11.30[4] km/s |
| Proper motion (μ) | RA: 14.27[1] mas/yr Dec.: 8.80[1] mas/yr |
| Parallax (π) | 3.3735 ± 0.1766 mas[5] |
| Distance | 970 ± 50 ly (300 ± 20 pc) |
| Details | |
| Radius | 76.78[5] R☉ |
| Luminosity | 1,078[6] L☉ |
| Temperature | 3,682[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, Bright Star Catalogue (5th rev. ed.) | |
101 Virginis is a red giant variable star in the Boötes constellation, currently on the asymptotic giant branch.[7] Its apparent magnitude ranges from 5.74 to 5.9, making it faintly visible to the naked eye under good observing conditions. It was originally catalogued as 101 Virginis by Flamsteed due to an error in the position.[8][9] John R. Percy found it to be "marginally variable" in 1993.[10] When it was confirmed as a variable star, it was actually within the border of the constellation Boötes and given the name CY Boötis.[11]
The variability is not strongly defined but a primary period of 23 days and a secondary period of 340 days have been reported.[12]
CY Boo is listed in the Hipparcos catalogue as a "problem binary", a star which was suspected of being multiple but for which the Hipparcos observations did not give a satisfactory solution. Further observations have always shown it to be single.[13]
References
[edit]- ^ a b c d Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b Samus, N.N.; Kazarovets, E.V.; Durlevich, O.V.; Kireeva, N.N.; Pastukhova, E.N. "CY Boo". General Catalogue of Variable Stars. Lomonosov Moscow State University. Retrieved 6 December 2024.
- ^ Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics. 498 (2): 627. arXiv:0901.0934. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698. S2CID 18739721.
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
- ^ Eggen, Olin J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
- ^ Davies, H. S. (1905). "Flamsteed and Piazzi Identities". Popular Astronomy. 13: 423. Bibcode:1905PA.....13..423D.
- ^ Wagman, M. (1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 209. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.
- ^ Percy, John R. (December 1993). "The Photometric Variability of K Giants". Publications of the Astronomical Society of the Pacific. 105: 1422–1426. Bibcode:1993PASP..105.1422P. doi:10.1086/133324. Retrieved 6 December 2024.
- ^ Kazarovets, E. V.; Samus, N. N. (April 1997). "The 73rd Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4471: 1–45. Bibcode:1997IBVS.4471....1K. Retrieved 6 December 2024.
- ^ Percy, J. R.; Dunlop, H.; Kassim, L.; Thompson, R. R. (2001). "Periods of 25 Pulsating Red Giants". Information Bulletin on Variable Stars. 5041: 1. Bibcode:2001IBVS.5041....1P.
- ^ Mason, Brian D.; Martin, Christian; Hartkopf, William I.; Barry, Donald J.; Germain, Marvin E.; Douglass, Geoffrey G.; Worley, Charles E.; Wycoff, Gary L.; Ten Brummelaar, Theo; Franz, Otto G. (1999). "Speckle Interferometry of New and Problem HIPPARCOS Binaries". The Astronomical Journal. 117 (4): 1890. Bibcode:1999AJ....117.1890M. doi:10.1086/300823.
External links
[edit]- VizieR: HR 5352
- Aladin: Image 101 Virginis
