Astronomy:HD 149837

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Short description: Binary star in the constellation Ara
HD 149837
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Ara[1]
A
Right ascension  16h 40m 50.48327s[2]
Declination −60° 26′ 47.2071″[2]
Apparent magnitude (V) 6.18[3]
B
Right ascension  16h 40m 50.61454s[4]
Declination −60° 26′ 45.8673″[4]
Apparent magnitude (V) 8.98[5]
Characteristics
A
Evolutionary stage main sequence[2]
Spectral type F6V[6]
Apparent magnitude (B) 6.660
Apparent magnitude (J) 5.217
Apparent magnitude (H) 4.969
Apparent magnitude (K) 4.886
B−V color index +0.17[3]
Astrometry
A
Radial velocity (Rv)3.9±0.2[7] km/s
Proper motion (μ) RA: +59.084[2] mas/yr
Dec.: −73.274[2] mas/yr
Parallax (π)31.3707 ± 0.0212[2] mas
Distance103.97 ± 0.07 ly
(31.88 ± 0.02 pc)
Absolute magnitude (MV)+3.69[1]
B
Proper motion (μ) RA: +57.834 mas/yr
Dec.: −76.449 mas/yr
Parallax (π)31.3785 ± 0.0402[4] mas
Distance103.9 ± 0.1 ly
(31.87 ± 0.04 pc)
Details
A
Mass1.25[8] M☉
Radius1.348[9] R☉
Luminosity2.634[9] L☉
Surface gravity (log g)4.16[6] cgs
Temperature6,401±80[10] K
Metallicity [Fe/H]−0.08[6] dex
Age2.90[10] Gyr
B
Mass0.79[8] M☉
Radius0.67[11] R☉
Luminosity0.248[11] L☉
Temperature4,987[11] K
Other designations
CD−60°6381, HD 149837, HIP 81657, HR 6177, SAO 253651
Database references
SIMBADdata
B

HD 149837 is a binary star in the southern constellation of Ara. Parallax measurements give a distance of 103.9 light-years.

The components of this system have an estimated separation of 45.8 astronomical units.[8] The primary, of apparent magnitude +6.24, can be viewed to the naked eye only from sufficiently dark skies, far from light pollution.[12] Its spectrum mathces a class of F6V,[6] making it a F-type main-sequence star. Around 1.25 times more massive than the Sun[8] and 2.9 billion years old,[10] it has 1.35 times the Sun's radius and irradiates 2.6 times the Sun's luminosity from its photosphere[9] at an effective temperature of 6,401 K.[10]

The secondary's apparent magnitude is 8.98,[5] too faint to be viewed with the naked eye.[12] It has 0.79 times the mass of the Sun, 0.67 times the radius and irradiates 25% of its luminosity at an effective temperature of 4,987 K.[11]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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.
  3. ↑ 3.0 3.1 Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series 34: 1–49. Bibcode: 1978A&AS...34....1N. 
  4. ↑ 4.0 4.1 4.2 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.
  5. ↑ 5.0 5.1 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics 384: 180. doi:10.1051/0004-6361:20011822. Bibcode: 2002A&A...384..180F. 
  6. ↑ 6.0 6.1 6.2 6.3 Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G. 
  7. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  8. ↑ 8.0 8.1 8.2 8.3 Tokovinin, Andrei (April 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal 147 (4): 14. doi:10.1088/0004-6256/147/4/87. 87. Bibcode: 2014AJ....147...87T. 
  9. ↑ 9.0 9.1 9.2 Schofield, Mathew; Chaplin, William J.; Huber, Daniel; Campante, Tiago L.; Davies, Guy R.; Miglio, Andrea; Ball, Warrick H.; Appourchaux, Thierry et al. (2019-03-01). "The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite". The Astrophysical Journal Supplement Series 241 (1): 12. doi:10.3847/1538-4365/ab04f5. ISSN 0067-0049. Bibcode: 2019ApJS..241...12S. 
  10. ↑ 10.0 10.1 10.2 10.3 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey" (in en). Astronomy and Astrophysics 530: A138. doi:10.1051/0004-6361/201016276. ISSN 0004-6361. Bibcode: 2011A&A...530A.138C. 
  11. ↑ 11.0 11.1 11.2 11.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  12. ↑ 12.0 12.1 "Limiting Magnitude | COSMOS". https://astronomy.swin.edu.au/cosmos/l/Limiting+Magnitude. 



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