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HD 137366 - Wikipedia

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HD 137366
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Apus
Right ascension	15^h 30^m 49.18128^s^[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 (M_V)	−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
30 G. Apodis [10], CD−71°1162, CPD−71°1852, GC 20789, HD 137366, HIP 75959, SAO 257284^[11]
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^[12] 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

^ ^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.

Constellation of Apus

Stars

Bayer	α β γ δ ε ζ η θ ι κ¹ κ²
Variable	R (not variable) S Z MY NN NO
HR	5240 5279 5306 5327 5389 5520 5547 5555 5628 5757 5786 5955 6135 6357 6373 6635 6646 6731 6751
HD	128294 129899 131664 134606 137366 137388 (Karaka) 141846 152010
Other	Godzilla star

Star
clusters

NGC	6101
Other	IC 4499

Nebulae	Hen 2-131

Galaxies	Sunburst galaxy