Astronomy:HD 174430

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Short description: B-type giant in the constellation Telescopium
HD 174430
Telescopium constellation map.svg
Red circle.svg
Location of HD 174430 and κ Tel (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Telescopium
Right ascension  18h 53m 12.00295s[1]
Declination −51° 55′ 53.1748″[1]
Apparent magnitude (V) 6.29±0.01[2]
Characteristics
Spectral type B3/5 III[3]
B−V color index −0.09[4]
Astrometry
Radial velocity (Rv)−23.0±4.3[5] km/s
Proper motion (μ) RA: +2.869[1] mas/yr
Dec.: −12.640[1] mas/yr
Parallax (π)2.8731 ± 0.0531[1] mas
Distance1,140 ± 20 ly
(348 ± 6 pc)
Absolute magnitude (MV)−1.80[6]
Details
Mass4.05[7] M☉
Radius5.72±0.29[8] R☉
Luminosity696[9] L☉
Surface gravity (log g)3.56[7] cgs
Temperature14,824[10] K
Metallicity [Fe/H]−0.01[7] dex
Age76[11] Myr
Other designations
CD−52°8861, CPD−52°11273, GC 25871, HD 174430, HIP 92687, HR 7093, SAO 245783[12]
Database references
SIMBADdata

HD 174430, also designated as HR 7093 or rarely 32 G. Telescopii, is a solitary blue-hued star located in the southern constellation Telescopium near Kappa Telescopii. It has an apparent magnitude of 6.29,[2] placing it near the limit for naked eye, even under ideal conditions. The object is located relatively far at a distance of 1,140 light-years based on Gaia DR3 parallax measurements,[1] but it is drifitng closer with a heliocentric radial velocity of −23 km/s.[5] At its current distance, HD 174430's brightness is diminished by 0.32 magnitudes due to interstellar extinction[13] and it has an absolute magnitude of −1.80.[6]

HD 174430 has a stellar classification of B3/5 III,[3] indicating that it is an evolved B-type star with the characteristics of a B3 and B5 giant star. It has also been given a less evolved class of B6 V.[14] It has 4.05 times the mass of the Sun[7] and 5.72 times the radius of the Sun.[8] It radiates 696 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 14,824 K.[10] HD 174430 has a near solar metallicity of [Fe/H] = −0.01[7] and it is estimated to be 76 million years old.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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. ↑ 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. ↑ 3.0 3.1 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. 2. Bibcode: 1978mcts.book.....H. 
  4. ↑ 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. ISSN 0024-8266. Bibcode: 1971MNSSA..30...37C. 
  5. ↑ 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. 
  6. ↑ 6.0 6.1 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. ↑ 7.0 7.1 7.2 7.3 7.4 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. 
  8. ↑ 8.0 8.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 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. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  10. ↑ 10.0 10.1 Philip, A. G. D.; Egret, D. (May 1980). "An analysis of the Hauck-Mermillod catalogue of homogeneous four-color data. II.". Astronomy and Astrophysics Supplement Series 40: 199–205. ISSN 0365-0138. Bibcode: 1980A&AS...40..199P. 
  11. ↑ 11.0 11.1 Westin, T. N. G. (April 1985). "The local system of early type stars. Spatial extent and kinematics.". Astronomy and Astrophysics Supplement Series 60: 99–134. ISSN 0365-0138. Bibcode: 1985A&AS...60...99W. 
  12. ↑ "HD 177430". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+177430. 
  13. ↑ Guarinos, J. (February 1995). "VizieR Online Data Catalog: Interstellar matter in the Galactic Disk (Guarinos J., 1992)". VizieR Online Data Catalog: 301V/86. Bibcode: 1995yCat.5086....0G. 
  14. ↑ Cucchiaro, A.; Macau-Hercot, D.; Jaschek, M.; Jaschek, C. (October 1977). "Spectral classification from the ultraviolet line features of S2/68 spectra. II. Late B-type stars.". Astronomy and Astrophysics Supplement Series 30: 71–79. ISSN 0365-0138. Bibcode: 1977A&AS...30...71C. 
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