R Puppis

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R Puppis
Puppis constellation map.svg
Red circle.svg
Location of R Puppis (circled)
Observation data
Epoch J2000       Equinox J2000
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  mas [1]
Distance 13,400 ± 1,000  ly
(4,100 ± 300  pc)
Absolute magnitude  (MV)−7.8 [5]
Details
Mass 14.3 [6]   M☉
Radius 477+28
−22 [7]   R☉
Luminosity 96,600±26,100 [7]   L☉
Surface gravity (log g)0.30 [8]   cgs
Temperature 5,495; (4,100±68 –6,500) [8]   K
Metallicity [Fe/H]−0.25 [8]   dex
Other designations
CD−31°4910, GSC  07106-03582, HIP  37415, HR  2974, HD  62058
Database references
SIMBAD data
NGC 2439, with R Puppis the brightest star NGC 2439 DSS.jpg
NGC 2439, with R Puppis the brightest star

R Puppis 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

A visual band light curve for R Puppis, plotted from ASAS data RPupLightCurve.png
A visual band light curve for R Puppis, plotted from ASAS data

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. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR .
  2. 1 2 3 Samus, N. N.; Durlevich, O. V.; 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.
  3. ↑ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. S2CID   123149047.
  4. 1 2 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.
  5. ↑ 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. ↑ Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
  7. 1 2 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 .
  8. 1 2 3 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. Bibcode:2011AstL...37..499U. doi:10.1134/S1063773711070061. S2CID   122968535.
  9. ↑ Garcia, B. (1989). "A list of MK standard stars". Bulletin d'Information du Centre de Données Stellaires. 36: 27. Bibcode:1989BICDS..36...27G.
  10. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  11. 1 2 3 Eggen, O. J. (March 1983). "Pseudocepheids. I. R Puppis, HR 4441, HR 4511, and AI CMi". Astronomical Journal . 88: 386–403. Bibcode:1983AJ.....88..386E. doi:10.1086/113323.
  12. ↑ Stift, M. J. (September 1978). "R Pup - a Variable after all". Information Bulletin on Variable Stars . 1473: 1. Bibcode:1978IBVS.1473....1S.
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