HD 208741

Last updated
HD 208741
Observation data
Epoch J2000       Equinox J2000
Constellation Octans
A
Right ascension 22h 03m 03.8227s [1]
Declination −76° 07′ 06.453″ [1]
Apparent magnitude  (V)5.93±0.01 [2]
B
Right ascension 22h 03m 12.9150s [3]
Declination −76° 06′ 54.860″ [3]
Apparent magnitude  (V)10.57 [4]
Characteristics
A
Evolutionary stage main sequence [5]
Spectral type F3 III [6] [7]
U−B color index +0.11 [8]
B−V color index +0.39 [8]
B
Spectral type K5 [9]
B−V color index +0.7
Astrometry
Radial velocity (Rv)8±1.1 [10]  km/s
Absolute magnitude  (MV)+1.96 [11]
A
Proper motion (μ)RA: +24.821 [1]   mas/yr
Dec.: −72.437 [1]   mas/yr
Parallax (π)15.4736 ± 0.0383  mas [1]
Distance 210.8 ± 0.5  ly
(64.6 ± 0.2  pc)
B
Proper motion (μ)RA: +29.912 [3]   mas/yr
Dec.: −71.414 [3]   mas/yr
Parallax (π)15.5058 ± 0.0249  mas [3]
Distance 210.3 ± 0.3  ly
(64.5 ± 0.1  pc)
Details
A
Mass 1.52±0.25 [12]   M☉
Radius 2.6±0.1 [12]   R☉
Luminosity 12.9 [13]   L☉
Surface gravity (log g)3.89 [14]   cgs
Temperature 6,937±80 [14]   K
Metallicity [Fe/H]+0.33 [14]   dex
Rotational velocity (v sin i)36 [15]  km/s
Age 1.1±0.1 [16]   Gyr
Other designations
66 G. Octantis, CD−76°1113, CPD−76°1542, FK5  3760, GC  30788, HD  208741, HIP  108849, HR  8380, SAO  257993, WDS J22031-7607A
Database references
SIMBAD A
B

HD 208741, also known as HR 8380, is a yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.91, [2] making it faintly visible to the naked eye. Parallax measurements place it at a distance of 211 light years, [1] and it is currently receding with a heliocentric radial velocity of 8  km/s . [10]

HD 208741 has a 10th magnitude K-type main-sequence companion [9] separated by 34.8″ . [4] Together, they make up a wide binary system designated collectively as CPD−76°1542. [4] Sir John Herschel, the discoverer of the pair, noted the primary to be a probable spectroscopic binary. [17]

This object has a stellar classification of F3 III, [6] [7] indicating that it is a slightly evolved F-type star. Gaia Data Release 3 models it to be a dwarf that is 81.3% through its main sequence lifetime. [5] At present it has 1.52 times the mass of the Sun and a slightly enlarged radius of 2.6  R☉ [12] due to its evolved state. It radiates at 12.9 times the luminosity of the Sun [13] from its photosphere at an effective temperature of 6,937  K . [14] HD 208741 has a metallicity twice the Sun's, [14] making it metal enriched. It is estimated to be 1.1 billion years old, [16] and is spinning with a projected rotational velocity of 36  km/s . [15]

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HD 1032 is a solitary star in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude of 5.77 and is estimated to be 850 light years away from the Solar System based on parallax measure. However, it is receding with a heliocentric radial velocity of 4 km/s.

HD 193373 is a solitary red hued star located in the equatorial constellation Delphinus. It has an apparent magnitude of 6.21, placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant and it is currently receding with a heliocentric radial velocity of 22.7 km/s.

HD 194612 is a solitary orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.9, making it visible to the naked eye under ideal conditions. Parallax measurements place it at a distance of 760 light years and it has a low heliocentric radial velocity of 0.3 km/s.

HD 182509, also designated as HR 7370, is an orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.69, making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 635 light years. It has a poorly constrained heliocentric radial velocity of −5 km/s, indicating that it is drifting towards the Solar System.

References

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  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.
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  6. 1 2 de Vaucouleurs, A. (1 August 1957). "Spectral Types and Luminosities of B, A and F Southern Stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449–462. Bibcode:1957MNRAS.117..449D. doi: 10.1093/mnras/117.4.449 . eISSN   1365-2966. ISSN   0035-8711.
  7. 1 2 Malaroda, S. (August 1975). "Study of the F-type 1 MK spectral types". The Astronomical Journal. 80: 637. Bibcode:1975AJ.....80..637M. doi: 10.1086/111786 . ISSN   0004-6256.
  8. 1 2 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.
  9. 1 2 Stoy, R. H. (1966). "Cape photographic catalogue for 1950.0; Meridian positions of standard stars, zone −64° to −80°". Annals of the Cape Observatory. 21: 0. Bibcode:1966AnCap..21....0S.
  10. 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.
  11. ↑ 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.
  12. 1 2 3 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881.
  13. 1 2 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037 . Bibcode:2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x . eISSN   1365-2966. ISSN   0035-8711.
  14. 1 2 3 4 5 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.
  15. 1 2 Erspamer, D.; North, P. (28 January 2003). "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs". Astronomy & Astrophysics. 398 (3): 1121–1135. arXiv: astro-ph/0210065 . Bibcode:2003A&A...398.1121E. doi: 10.1051/0004-6361:20021711 . eISSN   1432-0746. ISSN   0004-6361.
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  17. ↑ Herschel, J. F. W. (1835). "A Second Series of Micrometrical Measures of Double Stars chiefly performed with the 7-feet Equatorial, at Slough, in the years 1831, 1832, and 1833". Memoirs of the Royal Astronomical Society. 8: 37. Bibcode:1835MmRAS...8...37H.
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