Astronomy:HD 187734
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Short description: Star in the constellation Aquila
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 51m 26.84135s[1] |
| Declination | +04° 05′ 19.0767″[1] |
| Apparent magnitude (V) | 6.6242±0.0012[2] (6.71 + 9.42)[3] |
| Characteristics | |
| Spectral type | K2III + A5V[4] |
| Astrometry | |
| Radial velocity (Rv) | −3.70±0.21[2] km/s |
| Proper motion (μ) | RA: −1.70[1] mas/yr Dec.: −5.82[1] mas/yr |
| Parallax (π) | 1.31 ± 0.86[1] mas |
| Distance | approx. 2,000 ly (approx. 800 pc) |
| Details | |
| HD 187734 A | |
| Mass | 8.8±0.1[5] M☉ |
| Radius | 109[6] R☉ |
| Luminosity | 3,339[7] L☉ |
| Surface gravity (log g) | 1.17[6] cgs |
| Temperature | 4,128[7] K |
| Age | 29.0±3.4 Myr |
| HD 187734 B | |
| Mass | 2.7[8] M☉ |
| Radius | 3.1[8] R☉ |
| Luminosity | 100[8] L☉ |
| Surface gravity (log g) | 3.89[8] cgs |
| Temperature | 10.312[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| B | |
HD 187734 is double star in the equatorial constellation of Aquila. The primary is a magnitude 6.6 giant star, while the companion is a magnitude 9.4 A-type main sequence star.[4] As of 2014, the pair had an angular separation of 5″ along a position angle of 99°.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 Famaey, B. et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430: 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F
- ↑ 3.0 3.1 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds, retrieved 2015-07-22
- ↑ 4.0 4.1 Abt, H. A. (September 1985), "Visual multiples. VIII. 1000 MK types", Astrophysical Journal Supplement Series 59: 95–112, doi:10.1086/191064, Bibcode: 1985ApJS...59...95A
- ↑ Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M
- ↑ 8.0 8.1 8.2 8.3 8.4 Stassun, Keivan G. et al. (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.
External links
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