HD 63032

c Puppis, also known as HD 63032 and HR 3017, is a spectroscopic binary star^[3] in the constellation Puppis. Its apparent magnitude is of 3.61,^[2] making it the eight-brightest star in Puppis. The system is the brightest member of the open cluster NGC 2451, over two magnitudes brighter than every other star in the cluster. As the turnoff point of the cluster is currently around B7, the parameters of the system fit with cluster membership.^[10]

c Puppis

The field of cluster NGC 2451; c Puppis is the brightest star in the frame
Observation data Epoch J2000      Equinox J2000
Constellation	Puppis
Right ascension	07h 45m 15.29613s[1]
Declination	−37° 58′ 06.9069″[1]
Apparent magnitude (V)	3.61[2]
Characteristics
Spectral type	K2.5Ib-IIa（K5IIa） + B9V[3]
Apparent magnitude (U)	7.06[2]
Apparent magnitude (B)	5.34[2]
Apparent magnitude (R)	2.26[2]
Apparent magnitude (I)	1.26[2]
Apparent magnitude (J)	0.68[2]
Apparent magnitude (H)	-0.075 ± 0.220[4]
Apparent magnitude (K)	-0.47[4]
U−B color index	1.72
B−V color index	1.73
Astrometry
Radial velocity (Rv)	16.83 ± 0.14[5] km/s
Proper motion (μ)	RA: −10.54 mas/yr[1] Dec.: 5.584 mas/yr[1]
Parallax (π)	2.9460 ± 0.1482 mas[1]
Distance	1114+67 −64 ly (341.7+20.5 −19.5 pc)[6]
Details
A
Mass	12.1±1.2[7] M☉
Radius	274±14 – 301[8] R☉
Luminosity	15,152[9] L☉
Temperature	3,781[9] K
Age	15.8±0.4[7] Myr
B
Radius	2.0±0.3[10] R☉
Temperature	10,200 ± 300[10] K
Other designations
CD−37 3863, CPD−37 1558, HD 63032, HIP 37819, HR 3017, SAO 198398
Database references
SIMBAD	data

The primary component of the system is a red supergiant or bright giant of spectral classification K2.5Ib-IIa.^[3] It is twelve times more massive than the Sun, and is estimated 16 million years old.^[7] At this evolutionary stage, it has expanded to 280 times the size of the Sun^[8] and is 15,000 more luminous. Its surface has cooled to an effective temperature of 3,781 K,^[9] giving it a red-orange hue.^[11] The secondary component is a late B-type star, about two times the size of the Sun. c Puppis was first discovered to be a spectroscopic binary in 1982, by D. Groote and D. Reimers.^[10]

References

1. 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. 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: 0. Bibcode:2002yCat.2237....0D.
3. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
4. Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
5. Mermilliod, J. C.; Mayor, M.; Udry, S. (2008), "Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters" (PDF), Astronomy and Astrophysics, 485 (1): 303–314, Bibcode:2008A&A...485..303M, doi:10.1051/0004-6361:200809664
6. Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
7. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011-01-01). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. c Puppis' database entry at VizieR.
8. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022-01-01). "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs". Astronomy and Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. c Puppis' database entry at VizieR.
9. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012-11-01), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427: 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, ISSN 0035-8711 c Puppis' database entry at VizieR.
10. Groote, D.; Reimers, D. (1983). "Detection of a late B star companion of the bright cluster giant c Pup = HD 63032". Astronomy and Astrophysics. 119 (2): 319–320. Bibcode:1983A&A...119..319G.
11. "The Colour of Stars". Australia National Telescope Facility. 6 March 2024. Retrieved 2024-05-27.