Astronomy:HD 115337

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Short description: Star in the constellation Camelopardalis
HD 115337
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  13h 12m 25.43269s[1]
Declination +80° 28′ 16.7089″[1]
Apparent magnitude (V) 6.25[2] (6.33 + 9.04)[3]
Characteristics
Spectral type K0 Ib[4] + A8 V:[5]
B−V color index +0.94[2]
Astrometry
Radial velocity (Rv)−9.38±0.21[6] km/s
Proper motion (μ) RA: −6.288[1] mas/yr
Dec.: +10.446[1] mas/yr
Parallax (π)4.6717 ± 0.0166[1] mas
Distance698 ± 2 ly
(214.1 ± 0.8 pc)
Absolute magnitude (MV)−0.32[7]
Details
A
Mass3.4[1] M☉
Radius16.4[1] R☉
Luminosity161[1] L☉
Surface gravity (log g)2.38[1] cgs
Temperature5,160[1] K
Metallicity [Fe/H]−0.13[1] dex
Rotational velocity (v sin i)<1[8] km/s
Age270[1] Myr
Other designations
BD+81 416, FK5 3056, GC 17932, HD 115337, HIP 64437, HR 5009, SAO 2164, WDS J13124+8028A[9]
Database references
SIMBADdata

HD 115337 is a binary star located in the northern circumpolar constellation Camelopardalis. The pair have a combined apparent magnitude of 6.25,[2] placing it near the limit for naked eye visibility. Parallax measurements place the system at a distance of 698 light years.[1] It has a heliocentric radial velocity of −9.4 km/s,[6] indicating that it is drifting towards the Solar System.

The components have spectral classifications of K0 Ib[4] and A8 V,[5] indicating a K-type lower luminosity supergiant and an A-type main-sequence star (with uncertainty). At present the primary has 3.4 times the mass of the Sun and an enlarged radius of 16.4 R☉ due to its evolved status. It radiates 161 times the luminosity of the Sun from its photosphere at an effective temperature of 5,160 K,[10] giving a yellowish orange hue. HD 115337A is metal deficent, having an iron abundance only 74% of solar levels. Like most giants, it spins slowly with a projected rotational velocity of less than 1 km/s.[8]

Ironically, the characteristics of HD 115337A belong to a giant star as opposed to a supergiant. It has even been classified as G5 III[11] or G8 III,[5] more consistent with the above properties. Nevertheless, optical measurements from Mason et al. (2001) find the pair to have a mean separation of an arcsecond along a position angle of 184°.[12]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode: 1970Priv.........0H. 
  3. ↑ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (March 2002). "The Tycho double star catalogue". Astronomy & Astrophysics 384 (1): 180–189. doi:10.1051/0004-6361:20011822. ISSN 0004-6361. Bibcode: 2002A&A...384..180F. 
  4. ↑ 4.0 4.1 Cowley, A. P.; Bidelman, W. P. (February 1979). "MK spectral types for some F and G stars.". Publications of the Astronomical Society of the Pacific 91: 83. doi:10.1086/130446. ISSN 0004-6280. Bibcode: 1979PASP...91...83C. 
  5. ↑ 5.0 5.1 5.2 Stephenson, C. B.; Sanwal, N. B. (June 1969). "The masses of stars above the main sequence.". The Astronomical Journal 74: 689. doi:10.1086/110845. ISSN 0004-6256. Bibcode: 1969AJ.....74..689S. 
  6. ↑ 6.0 6.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  9. ↑ "HR 5009". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+5009. 
  10. ↑ Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal 81: 187. doi:10.1086/143628. ISSN 0004-637X. Bibcode: 1935ApJ....81..187A. 
  12. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 

See also



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