Astronomy:R Puppis
Observation data Equinox J2000.0]] (ICRS) | |
---|---|
Constellation | Puppis |
Right ascension | 07h 40m 52.597s[1] |
Declination | −31° 39′ 40.20″[1] |
Apparent magnitude (V) | 6.50 - 6.71[2] |
Characteristics | |
Spectral type | G2 0-Ia[3] |
U−B color index | +0.85[4] |
B−V color index | +1.18[4] |
Variable type | SRd[2] |
Astrometry | |
Radial velocity (Rv) | +68.22[1] km/s |
Proper motion (μ) | RA: −2.251[1] mas/yr Dec.: +3.222[1] mas/yr |
Parallax (π) | 0.2440 ± 0.0180[1] mas |
Distance | 13,400 ± 1,000 ly (4,100 ± 300 pc) |
Absolute magnitude (MV) | −7.8[5] |
Details | |
Mass | 14.3[6] M☉ |
Radius | 477[7] R☉ |
Luminosity | 96,607[7] L☉ |
Surface gravity (log g) | 0.30[8] cgs |
Temperature | 6,561[6] K |
Metallicity [Fe/H] | −0.25[8] dex |
Other designations | |
Database references | |
SIMBAD | data |
HD 62058, (Variable star designation R Puppis, R Pup) is a variable star in the constellation Puppis. It is a rare yellow hypergiant and a candidate member of the open cluster NGC 2439. It is also an MK spectral standard for the class G2 0-Ia.[9]
Variability
R Puppis was identified as a variable star in 1879, and described as having a range of over a magnitude.[11] Numerous observations over the following 100 years failed to confirm the variations, until the 1970s when clear brightness changes were observed.[12] These were confirmed by later observations, but with a total visual amplitude of only about 0.2 magnitudes.[11]
Variable stars such as R Puppis have been described as pseudo-Cepheids, because they lie above the high-luminosity portion of the instability strip and their variations are similar to those of Cepheids although less regular.[11] R Puppis is formally classified as a semiregular variable of type SRd, meaning F, G, or K giants or supergiants.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
- ↑ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ Arellano Ferro, A.; Parrao, L. (1990). "Colour excesses and absolute magnitudes for non-Cepheid F-G supergiants from uvbybeta photometry". Astronomy and Astrophysics 239: 205. Bibcode: 1990A&A...239..205A.
- ↑ 6.0 6.1 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O. et al. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1354....0A.
- ↑ 7.0 7.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 8.0 8.1 Usenko, I. A.; Kniazev, A. Yu.; Berdnikov, L. N.; Kravtsov, V. V. (2011). "Spectroscopic studies of Cepheids (S Cru, AP Pup, AX Cir, S TrA, T Cru, R Mus, S Mus, U Car) and semiregular bright supergiants (V382 Car, HD 75276, R Pup) in the southern hemisphere". Astronomy Letters 37 (7): 499. doi:10.1134/S1063773711070061. Bibcode: 2011AstL...37..499U.
- ↑ Garcia, B. (1989). "A list of MK standard stars". Bulletin d'Information du Centre de Données Stellaires 36: 27. Bibcode: 1989BICDS..36...27G.
- ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. http://www.astrouw.edu.pl/asas/?page=aasc.
- ↑ 11.0 11.1 11.2 Eggen, O. J. (March 1983). "Pseudocepheids. I. R Puppis, HR 4441, HR 4511, and AI CMi". Astronomical Journal 88: 386–403. doi:10.1086/113323. Bibcode: 1983AJ.....88..386E.
- ↑ Stift, M. J. (September 1978). "R Pup - a Variable after all". Information Bulletin on Variable Stars 1473: 1. Bibcode: 1978IBVS.1473....1S.
Original source: https://en.wikipedia.org/wiki/R Puppis.
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