HD 181295

Last updated
HD 181295
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 22m 37.74947s [1]
Declination −51° 13′ 52.6099″ [1]
Apparent magnitude  (V)6.42±0.01 [2]
Characteristics
Evolutionary stage main sequence star [3]
Spectral type F0 V [4]
B−V color index 0.328±0.007 [5]
Astrometry
Radial velocity (Rv)−35.7±0.5 [6] km/s
Proper motion (μ)RA: 73.087 mas/yr [1]
Dec.: −8.778 mas/yr [1]
Parallax (π)12.9643±0.4818  mas [1]
Distance 252 ± 9  ly
(77 ± 3  pc)
Absolute magnitude  (MV)+2.14 [5]
Details
Mass 1.74 [7]   M☉
Radius 2.35±0.15 [8]   R☉
Luminosity 13.3+0.9
−0.8 [1]   L☉
Surface gravity (log g)3.84 [9]   cgs
Temperature 6,850±69 [8]   K
Metallicity [Fe/H]−0.27 [10]   dex
Rotation 2.7  d [11]
Rotational velocity (v sin i)56.9±1.9 [11]  km/s
Age 1.41 [7]   Gyr
Other designations
56 G. Telescopii [12] , CD−51°12054, CPD−51°11215, GC 22691, HD 181295, HIP 95239, SAO 246053, TIC 424748146 [13]
Database references
SIMBAD data

HD 181295 is a star located in the southern constellation Telescopium. It has an apparent magnitude of 6.42, [2] placing it near the limit of naked eye visibility, even under ideal conditions. The object is located relatively close at a distance of approximately 252 light-years based on Gaia DR3 parallax measurements, [1] and it is currently drifting closer with a heliocentric radial velocity of −35.7  km/s . [6] At its current distance, HD 181295's brightness is diminished by 0.22 magnitudes [14] due to interstellar extinction and it has an absolute magnitude +2.14. [5]

Proper motion variations from this star was first detected in a 2005 Hipparcos proper motion survey. [15] These variations indicated the presence of an unseen companion tugging on the star. As of the follow up survey published in 2006, it is considered a probable astrometric binary with a 97% chance. [16]

The visible component has a stellar classification of F0 V, [4] indicating that it is an ordinary F-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 1.74 times the mass of the Sun [7] and 2.35 times the radius of the Sun. [8] It radiates 13.3 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,850  K , [8] giving it the typical yellowish-white of a F-type star. At the age of 1.41 billion years, [7] HD 181295A is a rather evolved star for its class, having completed 77.3% of its main sequence lifetime. [3] The star has an iron abundance of [Fe/H] = −0.27 [10] and it spins modestly with a projected rotational velocity of 56.9  km/s within 2.7 days. [11]

References

  1. 1 2 3 4 5 6 7 8 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.
  2. 1 2 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.
  3. 1 2 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361. S2CID   55586789.
  4. 1 2 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.
  5. 1 2 3 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.
  6. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  7. 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154 . Bibcode:2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146 . eISSN   1538-4357. S2CID   33401607.
  8. 1 2 3 4 Masana, E.; Jordi, C.; Ribas, I. (10 April 2006). "Effective temperature scale and bolometric corrections from 2MASS photometry". Astronomy & Astrophysics. 450 (2): 735–746. arXiv: astro-ph/0601049 . Bibcode:2006A&A...450..735M. doi: 10.1051/0004-6361:20054021 . eISSN   1432-0746. ISSN   0004-6361. S2CID   15278668.
  9. ↑ Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv: 1103.4651 . Bibcode:2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276 . eISSN   1432-0746. ISSN   0004-6361. S2CID   56118016.
  10. 1 2 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv: 1705.00883 . Bibcode:2017MNRAS.469.3042N. doi: 10.1093/mnras/stx1077 . eISSN   1365-2966. ISSN   0035-8711. S2CID   119034918.
  11. 1 2 3 Reiners, A.; Royer, F. (February 2004). "First signatures of strong differential rotation in A-type stars". Astronomy & Astrophysics. 415 (1): 325–329. arXiv: astro-ph/0311341 . Bibcode:2004A&A...415..325R. doi: 10.1051/0004-6361:20034175 . eISSN   1432-0746. ISSN   0004-6361. S2CID   15726297.
  12. ↑ 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.
  13. ↑ "HD 181295". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved September 5, 2023.
  14. ↑ 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.
  15. ↑ Makarov, V. V.; Kaplan, G. H. (May 2005). "Statistical Constraints for Astrometric Binaries with Nonlinear Motion". The Astronomical Journal. 129 (5): 2420–2427. Bibcode:2005AJ....129.2420M. doi: 10.1086/429590 . eISSN   1538-3881. ISSN   0004-6256. S2CID   55186471.
  16. ↑ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue: Comparison with radial velocity data". Astronomy & Astrophysics. 464 (1): 377–392. arXiv: astro-ph/0612449 . Bibcode:2007A&A...464..377F. doi: 10.1051/0004-6361:20065526 . eISSN   1432-0746. ISSN   0004-6361. S2CID   14010423.
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