Astronomy:HD 133981
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Apus |
| Right ascension | 15h 12m 33.97907s[1] |
| Declination | −72° 46′ 14.1634″[1] |
| Apparent magnitude (V) | 6.02±0.01[2] |
| Characteristics | |
| Spectral type | B8 IV[3] |
| U−B color index | −0.24[4] |
| B−V color index | 0.00[4] |
| Astrometry | |
| Radial velocity (Rv) | −13.7±1.3[5] km/s |
| Proper motion (μ) | RA: −14.107[1] mas/yr Dec.: −16.361[1] mas/yr |
| Parallax (π) | 3.8088 ± 0.0418[1] mas |
| Distance | 856 ± 9 ly (263 ± 3 pc) |
| Absolute magnitude (MV) | −1.34[6] |
| Details | |
| Mass | 3.72+0.09−0.05[1] M☉ |
| Radius | 6.35[7] R☉ |
| Luminosity | 364+15−14[1] L☉ |
| Surface gravity (log g) | 3.48[8] cgs |
| Temperature | 10,250[9] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Age | 202+23−2[1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 133981, also known as HR 5628, is a solitary, bluish-white hued star located in the southern circumpolar constellation of Apus. It has an apparent magnitude of 6.02,[2] allowing it to be faintly visible to the naked eye in ideal conditions. The object is located relatively far at a distance of 856 light years based on parallax measurements from Gaia DR3[1] but is approaching the Solar System with a heliocentric radial velocity of −13.7 km/s.[5]
HD 133981 has a stellar classification of B8 IV,[3] indicating that it is a B-type star that is evolving towards the red giant branch. Houk and Cowley (1975) gave a slightly more evolved class of B8/9 III,[12] instead indicating that it is a giant star. Some evolutionary models show that it is a star just reaching the end of the main sequence.[1] Nevertheless, it has 3.72 times the mass of the Sun[1] and 6.35 times its girth.[7] It radiates 364 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 10,250 K.[9] HD 133981 is said to be 202 million years old.[1]
HD 133981 lies in front of the distant faint galaxy LEDA 54288.[13] A debris disk has been detected around the star. It has 22.5 times the mass of the Earth and an equilibrium temperature of 27 K.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| ' | 1,851 AU | — | — | |||
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 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 Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series 99: 135. doi:10.1086/192182. ISSN 0067-0049. Bibcode: 1995ApJS...99..135A.
- ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
- ↑ 5.0 5.1 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. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ 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.
- ↑ 7.0 7.1 Stassun, Keivan G. et al. (9 September 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.
- ↑ 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.
- ↑ 9.0 9.1 9.2 Liu, Qiong; Wang, Tinggui; Jiang, Peng (23 May 2014). "Bright Debris Disk Candidates Detected with the AKARI/Far-infrared Surveyor". The Astronomical Journal 148 (1): 3. doi:10.1088/0004-6256/148/1/3. ISSN 0004-6256. Bibcode: 2014AJ....148....3L.
- ↑ Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode: 2012AstL...38..771G.
- ↑ "HD 133981". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+133981.
- ↑ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode: 1975mcts.book.....H.
- ↑ "LEDA 54288". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LEDA+54288.
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