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[12] and it has an absolute magnitude of −1.54.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| 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 mas/yr[1] Dec.: −21.027 mas/yr[1] |
| Parallax (π) | 2.976 ± 0.0439 mas[1] |
| 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 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
edit- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
- ^ a b c Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d 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. 410 (1). Oxford University Press (OUP): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. S2CID 118629873.
- ^ a b c d 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. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711. S2CID 73594365.
- ^ 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. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b c d 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. 144 (5). American Astronomical Society: 130. arXiv:1208.1674. Bibcode:2012AJ....144..130B. doi:10.1088/0004-6256/144/5/130. ISSN 0004-6256. S2CID 118868235.
- ^ a b 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. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
- ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
- ^ 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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.