Astronomy:HD 137366
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Apus |
| Right ascension | 15h 30m 49.18128s[1] |
| Declination | −71° 39′ 14.8868″[1] |
| Apparent magnitude (V) | 6.38±0.01[2] |
| Characteristics | |
| Spectral type | B3 V[3] |
| B−V color index | −0.112±0.002[4] |
| Astrometry | |
| Proper motion (μ) | RA: −6.541[1] mas/yr Dec.: −21.027[1] mas/yr |
| Parallax (π) | 2.976 ± 0.0439[1] mas |
| Distance | 1,100 ± 20 ly (336 ± 5 pc) |
| Absolute magnitude (MV) | −1.54[4] |
| Details | |
| Mass | 7.0±0.1[5] M☉ |
| Radius | 5.6[6] R☉ |
| Luminosity | 953[6] L☉ |
| Surface gravity (log g) | 3.73[7] cgs |
| Temperature | 19,290[8] K |
| Metallicity [Fe/H] | −0.17[9] dex |
| Rotational velocity (v sin i) | 8[8] km/s |
| Age | 27.7±2.5[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 137366 is a solitary blue-hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.38,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of approximately 1,100 light-years based on Gaia DR3 parallax measurements,[1] but its heliocentric radial velocity is not known. At its current distance, HD 137366's brightness is diminished by three-tenths of a magnitudes due to interstellar extinction[11] and it has an absolute magnitude of −1.54.[4]
HD 137366 has a stellar classification of B3 V,[3] indicating that it is an ordinary B-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 7 times the mass of the Sun[5] and 5.6 times the radius of the Sun.[6] It radiates 953 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 19,290 K.[8] HD 137366 is metal deficient with an iron abundance 67.6% that of the Sun's ([Fe/H] = −0.17)[9] and it is estimated to be 27.7 million years old.[5] Unlike most hot stars, HD 137366 has a relatively low projected rotational velocity of only 8 km/s.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. 1. Bibcode: 1975mcts.book.....H.
- ↑ 4.0 4.1 4.2 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.
- ↑ 5.0 5.1 5.2 5.3 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society (Oxford University Press (OUP)) 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. Bibcode: 2011MNRAS.410..190T.
- ↑ 6.0 6.1 6.2 6.3 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M.
- ↑ Anders, F. et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A.
- ↑ 8.0 8.1 8.2 8.3 Bragança, G. A.; Daflon, S.; Cunha, K.; Bensby, T.; Oey, M. S.; Walth, G. (October 1, 2012). "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk". The Astronomical Journal (American Astronomical Society) 144 (5): 130. doi:10.1088/0004-6256/144/5/130. ISSN 0004-6256. Bibcode: 2012AJ....144..130B.
- ↑ 9.0 9.1 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ SIMBAD, HD 137366 (accessed 20 September 2015)
- ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G.
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