19 Puppis

19 Puppis is a binary star[10] system in the southern constellation of Puppis, near the northern border with Hydra and Monoceros. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.72.[2] The system is located approximately 177 light years away from the system based on parallax.[1] It is receding from the Earth with a heliocentric radial velocity of +36 km/s,[4] having come to within 31 light-years some 1.4 million years ago.[11]

19 Puppis
Location of 19 Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension  08h 11m 16.30585s[1]
Declination −12° 55′ 37.1952″[1]
Apparent magnitude (V) 4.72[2]
Characteristics
Spectral type G9III-IIIb[3]
U−B color index +0.76[2]
B−V color index +0.96[2]
Astrometry
Radial velocity (Rv)+36.07[4] km/s
Proper motion (μ) RA: −25.79[1] mas/yr
Dec.: +8.09[1] mas/yr
Parallax (π)18.46 ± 0.21[1] mas
Distance177 ± 2 ly
(54.2 ± 0.6 pc)
Absolute magnitude (MV)1.05[5]
Details
Mass1.05[6] M☉
Radius8.9[6] R☉
Luminosity43.31[5] L☉
Surface gravity (log g)2.56[6] cgs
Temperature4,750[7] K
Metallicity [Fe/H]+0.06[5] dex
Rotational velocity (v sin i)2.0[8] km/s
Age0.955+0.220
−0.185[9] Gyr
Other designations
19 Pup, BD−12°2385, GC 11134, HD 68290, HIP 40084, HR 3211, SAO 153942, CCDM J08112-1256AB, WDS J08113-1256AB, GSC 05434-03731
Database references
SIMBADdata

The primary, component A, is an aging giant star with a stellar classification of G9III-IIIb.[3] It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core.[12] The star is about one[9] billion years old with 1.05[6] times the mass of the Sun and 8.9[6] times the Sun's radius. It is radiating 43[5] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,750 K.[7]

The secondary member, component B, is a magnitude 11.2 star at an angular separation of 2.1″ from the primary.[10] Four visual companions have been reported. These are component C, at magnitude 13.2 and separation 30.7", D, at magnitude 8.9 and separation 57.8", E, at magnitude 9.37 and separation 70.1", and F, at magnitude 10.74 and separation 114.1".[13]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  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.
  3. Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
  5. 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. Vizier catalog entry
  6. Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
  7. Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785. arXiv:1607.00619. Bibcode:2008AstL...34..785G. doi:10.1134/S1063773708110078. Vizier catalog entry
  8. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  9. Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817: 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40.
  10. 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.
  11. Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, A35
  12. Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278.
  13. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
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