HD 178322

Last updated
HD 178322
Corona Australis constellation map.svg
Red circle.svg
Location of HD 178322 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 19h 09m 57.65200s [1]
Declination −41° 53′ 32.0836″ [1]
Apparent magnitude  (V)5.86±0.01 [2]
Characteristics
Spectral type B5 V + B6 V [3]
U−B color index −0.49 [4]
B−V color index −0.08 [4]
Variable type suspected [5]
Astrometry
Radial velocity (Rv)13.3±2 [6] km/s
Proper motion (μ)RA: −0.360 mas/yr [1]
Dec.: −10.096 mas/yr [1]
Parallax (π)2.104±0.1145  mas [1]
Distance 1,550 ± 80  ly
(480 ± 30  pc)
Absolute magnitude  (MV)−2.31 [7] (combined)
Orbit [8]
PrimaryA
CompanionB
Period (P)12.4700  d
Semi-major axis (a)0.235  AU [9]
Eccentricity (e)0.05
Inclination (i)71.19°
Periastron epoch (T)2,438,237.4500  JD
Argument of periastron (ω)
(secondary)		199.1 [10] °
Argument of periastron (ω)
(primary)		19.10 [10] °
Semi-amplitude (K1)
(primary)		79.70 km/s
Semi-amplitude (K2)
(secondary)		78.90 km/s
Details
Age 50.1±8.4 [11]   Myr
A
Mass 4.39 [10]   M☉
Radius 3.26 [9]   R☉
Luminosity 11,749 [12]   L☉
Temperature 15,488 [12]   K
Rotational velocity (v sin i)45 [9]  km/s
B
Mass 4.35 [10]   M☉
Radius 3.07 [9]   R☉
Luminosity513 [12]   L☉
Temperature 14,454 [12]   K
Rotational velocity (v sin i)45±7 [9]  km/s
Other designations
45 G. Coronae Australis [13] , CD−42°13933, CPD−42°8616, GC 26375, HD 178322, HIP 94157, HR 7257, SAO 229531 [14]
Database references
SIMBAD data

HD 178322, also known as HR 7257 or rarely 45 G. Coronae Australis, is a double-lined spectroscopic binary located in the southern constellation Corona Australis. It has a combined apparent magnitude of 5.86, [2] making it faintly visible to the naked eye under ideal conditions. The system is located relatively far at a distance of roughly 1,550 light-years based on Gaia DR3 parallax measurements, [1] and it is currently receding with a heliocentric radial velocity of 13.3  km/s . [6] At its current distance, HD 178322's brightness is diminished by an extinction of 0.28 magnitudes [15] and it has an absolute magnitude of −2.31. [7] The system has a high peculiar velocity of 28.9+4.1
−7.9  km/s , [11] indicating that it may be a runaway star system; it is said to be part of the Scorpius-Centaurus Association. [16]

The components of HD 178322 are both B-type main-sequence stars with stellar classifications of B5 V and B6 V respectively. [3] Both stars have roughly 4.4 times the mass of the Sun [10] and they spin moderately with projected rotational velocities of 45  km/s . [9] The primary has 3.26 times the radius of the Sun [9] and it radiates 11,749 times the luminosity of the Sun [12] from its photosphere at an effective temperature of 15,488  K . The companion has 3.07 times the Sun's girth [9] and it radiates 513 times the luminosity of the Sun [12] from its photosphere at an effective temperature of 14,454  K . [12] Both stars take roughly 12 days to complete a relatively circular orbit [8] at a separation of 0.235  AU . [9] The system is estimated to be 50 million years old. [11]

References

  1. 1 2 3 4 5 6 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 Levato, H. (January 1975). "Rotational velocities and spectral types for a sample of binary systems". Astronomy and Astrophysics Supplement Series. 19: 91–99. Bibcode:1975A&AS...19...91L. ISSN   0365-0138. S2CID   118523421.
  4. 1 2 Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968). "A Photometric Investigation of the SCORPlO-CENTAURUS Association". The Astrophysical Journal Supplement Series. 15: 459. Bibcode:1968ApJS...15..459G. doi: 10.1086/190168 . eISSN   1538-4365. ISSN   0067-0049. S2CID   123957668.
  5. ↑ Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN   1562-6881. ISSN   1063-7729. S2CID   125853869.
  6. 1 2 Evans, David S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E, doi:10.1017/S007418090010662X (inactive 31 December 2024), S2CID   122899856 {{citation}}: CS1 maint: DOI inactive as of December 2024 (link)
  7. 1 2 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.
  8. 1 2 Thackeray, A. D.; Hutchings, J. B. (1 February 1965). "Orbits of Two Double-lined Binaries HD 140008 and 178322". Monthly Notices of the Royal Astronomical Society. 129 (2): 191–197. Bibcode:1965MNRAS.129..191T. doi: 10.1093/mnras/129.2.191 . eISSN   1365-2966. ISSN   0035-8711. S2CID   125267464.
  9. 1 2 3 4 5 6 7 8 9 Howe, K. S.; Clarke, C. J. (1 January 2009). "An analysis of v sin (i) correlations in early-type binaries". Monthly Notices of the Royal Astronomical Society. 392 (1): 448–454. Bibcode:2009MNRAS.392..448H. doi: 10.1111/j.1365-2966.2008.14073.x . eISSN   1365-2966. ISSN   0035-8711. S2CID   120183969.
  10. 1 2 3 4 5 Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars". Bull. Inf. Centre Données Stellaires. 19: 71. Bibcode:1980BICDS..19...71K. S2CID   118298938.
  11. 1 2 3 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.
  12. 1 2 3 4 5 6 7 Vansina, F.; De Grève, J. P. (October 1982). "Close binary systems before and after mass transfer". Astrophysics and Space Science. 87 (1–2): 377–401. Bibcode:1982Ap&SS..87..377V. doi:10.1007/BF00648931. eISSN   1572-946X. ISSN   0004-640X. S2CID   123986012.
  13. ↑ 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.
  14. ↑ "HD 178322". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved May 30, 2023.
  15. ↑ Schmidt-Kaler, Th. (October 1982). "Automated spectral classification. A survey". Bulletin d'Information du Centre de Donnees Stellaires. 23: 2. Bibcode:1982BICDS..23....2S. ISSN   1169-8837. S2CID   230958433.
  16. ↑ Buscombe, W.; Morris, P. M. (1 September 1960). "The Scorpio-Centaurus Association: I. Radial Velocities of 120 Bright Stars". Monthly Notices of the Royal Astronomical Society. 121 (3): 263–278. Bibcode:1960MNRAS.121..263B. doi: 10.1093/mnras/121.3.263 . eISSN   1365-2966. ISSN   0035-8711. S2CID   121858509.
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