HD 174500, also designated as HR 7097 or rarely 34 G. Telescopii, is a solitary white-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.16,[2] placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place the object 692 light years away,[1] and it is currently receding with a heliocentric radial velocity of 35 km/s.[6] At its current distance, HD 174500's brightness is diminished by 0.39 magnitudes due to interstellar dust.[15] It has an absolute magnitude of −0.82.[7]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 52m 59.90009s[1] |
| Declination | −46° 35′ 10.7923″[1] |
| Apparent magnitude (V) | 6.16±0.01[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | A1 IV/V[4] |
| U−B color index | +0.05[5] |
| B−V color index | +0.04[5] |
| Astrometry | |
| Radial velocity (Rv) | 35.1±1.7[6] km/s |
| Proper motion (μ) | RA: +3.439 mas/yr[1] Dec.: +10.006 mas/yr[1] |
| Parallax (π) | 4.7156 ± 0.035 mas[1] |
| Distance | 692 ± 5 ly (212 ± 2 pc) |
| Absolute magnitude (MV) | −0.82[7] |
| Details | |
| Mass | 3.00±0.09[1] M☉ |
| Radius | 5.05±0.26[8] R☉ |
| Luminosity | 273+57 −47[3] L☉ |
| Surface gravity (log g) | 3.47+0.08 −0.05[9] cgs |
| Temperature | 9,594+134 −132[3] K |
| Metallicity [Fe/H] | +0.02[10] dex |
| Rotational velocity (v sin i) | 214[11] km/s |
| Age | 370[12] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 174500 has a stellar classification of A1 IV/V,[4] indicating that it is an evolved A-type star with the blended luminosity class of a subgiant and a main sequence star. It has 3 times the mass of the Sun[1] and an enlarged radius of 5.05 R☉.[8] It radiates 273 times the luminosity of the Sun from its photosphere at an effective temperature of 9,594 K.[3] At the age of 370 million years HD 174500 is currently on the subgiant track and is 1.8% past its main sequence lifetime.[3] Like many hot stars it spins rapidly, having a projected rotational velocity of 214 km/s.[11] It has a solar metallicity with [Fe/H] = +0.02.[10]
This object is located close to the 5th magnitude star HD 174387. However, they do not form a double star.
References
edit- ^ a b c d e f g 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.
- ^ a b 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.
- ^ a b c d e 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.
- ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
- ^ a b Alexander, J. B. (1972). "UBV observations of the RR Lyrae variable HD 176387 (MT Telescopii)". Royal Greenwich Observatory Bulletins. 174: 107. Bibcode:1972RGOB..174..107A.
- ^ a b 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.
- ^ a b 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.
- ^ a b 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.
- ^ 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. hdl:1721.1/124721. S2CID 166227927.
- ^ a b 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. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Royer, F.; Gerbaldi, M.; Faraggiana, R.; Gómez, A. E. (January 2002). "Rotational velocities of A-type stars. I. Measurement of vsini in the southern hemisphere". Astronomy & Astrophysics. 381 (1): 105–121. arXiv:astro-ph/0110490. Bibcode:2002A&A...381..105R. doi:10.1051/0004-6361:20011422. eISSN 1432-0746. ISSN 0004-6361.
- ^ Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv:1606.09028. Bibcode:2012AstL...38..694G. doi:10.1134/S1063773712110035. eISSN 1562-6873. ISSN 1063-7737. S2CID 255202762.
- ^ 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.
- ^ "HD 174500". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 February 2023.
- ^ 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.