Astronomy:HD 149837
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Short description: Binary star in the constellation Ara
| 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 | |
| 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 |
| Distance | 103.97 ± 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 |
| Distance | 103.9 ± 0.1 ly (31.87 ± 0.04 pc) |
| Details | |
| A | |
| Mass | 1.25[8] M☉ |
| Radius | 1.348[9] R☉ |
| Luminosity | 2.634[9] L☉ |
| Surface gravity (log g) | 4.16[6] cgs |
| Temperature | 6,401±80[10] K |
| Metallicity [Fe/H] | −0.08[6] dex |
| Age | 2.90[10] Gyr |
| B | |
| Mass | 0.79[8] M☉ |
| Radius | 0.67[11] R☉ |
| Luminosity | 0.248[11] L☉ |
| Temperature | 4,987[11] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ↑ 1.0 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.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 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.
- ↑ 4.0 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.
- ↑ 5.0 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.
- ↑ 6.0 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.
- ↑ 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.
- ↑ 8.0 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.
- ↑ 9.0 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.
- ↑ 10.0 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.
- ↑ 11.0 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.
- ↑ 12.0 12.1 "Limiting Magnitude | COSMOS". https://astronomy.swin.edu.au/cosmos/l/Limiting+Magnitude.
External links
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