Summary
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]
  | |
| 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 mas[1] |
| Distance | 177 ± 2 ly (54.2 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.05[5] |
| Details | |
| Mass | 1.05[6] M☉ |
| Radius | 8.9[6] R☉ |
| Luminosity | 43.31[5] L☉ |
| Surface gravity (log g) | 2.56[6] cgs |
| Temperature | 4,750[7] K |
| Metallicity [Fe/H] | +0.06[5] dex |
| Rotational velocity (v sin i) | 2.0[8] km/s |
| Age | 0.955+0.220 −0.185[9] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ a b c d e f 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. Vizier catalog entry
- ^ a b c d 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.
- ^ a b 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.
- ^ a b 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 (1): 209–231. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209. S2CID 121883397.
- ^ a b c d 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. Vizier catalog entry
- ^ a b c d e 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: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ a b Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785–796. arXiv:1607.00619. Bibcode:2008AstL...34..785G. doi:10.1134/S1063773708110078. S2CID 73524157. Vizier catalog entry
- ^ 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. S2CID 54046583. Vizier catalog entry
- ^ a b Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40, S2CID 118675933.
- ^ a b 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.
- ^ 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, S2CID 59039482, A35
- ^ 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, S2CID 16673121.
- ^ 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