HD 197630

Last updated
HD 197630
Microscopium constellation map.svg
Red circle.svg
HD 197630 is the star circled in red
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 20h 46m 20.06779s [1]
Declination −39° 11′ 57.3590″ [1]
Apparent magnitude  (V)5.47±0.01 [2]
Characteristics
Evolutionary stage main sequence star [3]
Spectral type B8/9 V [4]
B−V color index −0.10 [5]
Variable type suspected SPB [6]
Astrometry
Radial velocity (Rv)−30±7.4 [7]  km/s
Proper motion (μ)RA: +50.451  mas/yr [1]
Dec.: −27.196  mas/yr [1]
Parallax (π)9.9354 ± 0.1022  mas [1]
Distance 328 ± 3  ly
(101 ± 1  pc)
Absolute magnitude  (MV)+0.49 [8]
Details
Mass 2.83±0.04 [3]   M☉
Radius 2.56±0.13 [9]   R☉
Luminosity 73.5 [10]   L☉
Surface gravity (log g)4.11±0.14 [11]   cgs
Temperature 10,965+255
−250 [12]   K
Metallicity 59% solar
Metallicity [Fe/H]−0.23 [13]   dex
Rotational velocity (v sin i)290 [14]  km/s
Age 113 [11]   Myr
Other designations
23 G. Microscopii [15] , CD−39°13960, CPD−39°8771, FK5  3658, GC  28927, HD  197630, HIP  102497, HR  7933, SAO  212416 [16]
Database references
SIMBAD data

HD 197630, also known as HR 7933 or rarely 23 G. Microscopii, is a probable astrometric binary located in the southern constellation Microscopium. The visible component is a bluish-white hued star that is faintly visible to the naked eye with an apparent magnitude of 5.47. [2] Based on parallax measurements from the Gaia satellite, the system is estimated to be 328 light years away. [1] However, it is drifting closer with a heliocentric radial velocity of −30  km/s . At its current distance, HD 197630's brightness is diminished by 0.11 magnitudes due to interstellar dust. [17] A 2012 multiplicity survey failed to confirm the velocity variations. [18]

HD 197630 has a stellar classification of B8/9 V, [4] indicating that it is a B-type star with the characteristics of a B8 and B9 main sequence star. It has 2.83 times the mass of the Sun [3] and 2.56 times the Sun's radius. It radiates 73.5 times the luminosity of the Sun [10] from its photosphere at an effective temperature of 10,965  K . [12] The star is estimated to be 113 million years old, [11] having completed roughly half of its main sequence lifetime. [3] HD 19730 is spinning rapidly with a projected rotational velocity of 290  km/s . [14]

A light curve for HD 197630, plotted from TESS data HD197630LightCurve.png
A light curve for HD 197630, plotted from TESS data

The object was in a 2002 Hipparcos variability survey and as a result, [20] the AAVSO cataloged HD 197630 as a suspected variable star that fluctuates by 0.005 magnitudes within 7.71 hours. [21] However, subsequent observations have not confirmed this. Further data from the Transiting Exoplanet Survey Satellite suggests that HD 197630 may be a slowly pulsating B-type star plus a variable star with rotation modulations. [6]

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<span class="mw-page-title-main">HD 76236</span> Star in the constellation Chamaeleon

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<span class="mw-page-title-main">WZ Columbae</span> Star in the constellation of Columba

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<span class="mw-page-title-main">HD 198716</span> Star in the constellation of Microscopium

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<span class="mw-page-title-main">HD 36187</span> Star in the constellation of Columba

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<span class="mw-page-title-main">HD 117566</span> High proper motion star; Camelopardalis

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years and is currently receding with a heliocentric radial velocity of 18 km/s. At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust. It has an absolute magnitude of −0.76.

<span class="mw-page-title-main">HD 170642</span> A-type dwarf; Corona Australis

HD 170642, also designated as HR 6942 or rarely 13 G. Coronae Australis, is a single star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white hued star with an apparent magnitude of 5.16. The object is located relatively close at a distance of 229 light years based on Hipparcos parallax measurements, but it is approaching the Solar System with a somewhat constrained heliocentric radial velocity of −6 km/s. At its current distance, HD 170642's brightness is diminished by 0.28 magnitudes due to interstellar dust. It has an absolute magnitude of +0.93.

<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

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<span class="mw-page-title-main">HD 23005</span> Star in Camelopardlis

HD 23005, also known as HR 1124, is a soltiary, yellowish-white hued star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.78, making it faintly visible to the naked eye. The object is located relatively close at a distance of 173 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of 4.9 km/s. At its current distance, HD 23005's brightness is diminished by 0.15 magnitudes due to extinction from interstellar dust. It has an absolute magnitude of +2.07.

<span class="mw-page-title-main">HD 170521</span> Distant K-type giant; Corona Australis

HD 170521, also known as HR 6937 or rarely 12 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.69. The object is located relatively far at a distance of approximately 1,500 light years based on Gaia DR3 parallax measurements, and it is receding with a heliocentric radial velocity of 7.2 km/s. At its current distance, HD 170521's brightness is heavily diminished by 0.46 magnitudes due to extinction from interstellar dust and it has an absolute magnitude of −1.90.

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.
  3. 1 2 3 4 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. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  5. ↑ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode:1971MNSSA..30...37C. ISSN   0024-8266.
  6. 1 2 Pedersen, May G.; et al. (8 February 2019). "Diverse Variability of O and B Stars Revealed from 2-minute Cadence Light Curves in Sectors 1 and 2 of the TESS Mission: Selection of an Asteroseismic Sample". The Astrophysical Journal. 872 (1): L9. arXiv: 1901.07576 . Bibcode:2019ApJ...872L...9P. doi: 10.3847/2041-8213/ab01e1 . eISSN   2041-8213.
  7. ↑ Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv: 0705.0878 . Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. eISSN   1521-3994. ISSN   0004-6337. S2CID   119323941.
  8. ↑ 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.
  9. ↑ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361.
  10. 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.
  11. 1 2 3 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.
  12. 1 2 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002 . Bibcode:1999A&A...352..555A. ISSN   0004-6361.
  13. ↑ 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.
  14. 1 2 Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific. 215: 51. Bibcode:2004IAUS..215...51L.
  15. ↑ 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.
  16. ↑ "HD 197360". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved December 20, 2022.
  17. ↑ 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.
  18. ↑ Chini, R.; Hoffmeister, V. H.; Nasseri, A.; Stahl, O.; Zinnecker, H. (10 July 2012). "A spectroscopic survey on the multiplicity of high-mass stars". Monthly Notices of the Royal Astronomical Society. 424 (3): 1925–1929. arXiv: 1205.5238 . Bibcode:2012MNRAS.424.1925C. doi: 10.1111/j.1365-2966.2012.21317.x . ISSN   0035-8711.
  19. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  20. ↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv: astro-ph/0112194 . Bibcode:2002MNRAS.331...45K. doi: 10.1046/j.1365-8711.2002.05150.x . eISSN   1365-2966. ISSN   0035-8711.
  21. ↑ "VSX : Detail for HIP 102497". www.aavso.org. Retrieved 20 December 2022.
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