Astronomy:19 Puppis

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Short description: Binary star in the constellation Puppis
19 Puppis
Puppis constellation map.svg
Red circle.svg
Location of 19 Puppis (circled)
Observation data
Equinox J2000.0]] (ICRS)
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
Database references
SIMBADdata

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]

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  2. ↑ 2.0 2.1 2.2 2.3 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. ↑ 3.0 3.1 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. ↑ 4.0 4.1 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. doi:10.1088/0004-6256/135/1/209. Bibcode: 2008AJ....135..209M. 
  5. ↑ 5.0 5.1 5.2 5.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  Vizier catalog entry
  6. ↑ 6.0 6.1 6.2 6.3 6.4 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. Bibcode: 1999A&A...352..555A.  Vizier catalog entry
  7. ↑ 7.0 7.1 Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters 34 (11): 785–796. doi:10.1134/S1063773708110078. Bibcode: 2008AstL...34..785G.  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. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.  Vizier catalog entry
  9. ↑ 9.0 9.1 Feuillet, Diane K. et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal 817 (1): 40, doi:10.3847/0004-637X/817/1/40, Bibcode: 2016ApJ...817...40F. 
  10. ↑ 10.0 10.1 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  11. ↑ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics 575: 13, doi:10.1051/0004-6361/201425221, A35, Bibcode: 2015A&A...575A..35B 
  12. ↑ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A. 
  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. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.  Vizier catalog entry



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