24 Vulpeculae

24 Vulpeculae
Observation data; Epoch J2000 Equinox J2000
Constellation	Vulpecula
Right ascension	20h 16m 47.0863s
Declination	+24° 40′ 15.965″
Apparent magnitude (V)	5.30
Characteristics
Spectral type	G8III
B−V color index	0.951
Astrometry
Radial velocity (Rv)	+15.3±0.3 km/s
Proper motion (μ)	RA: 15.128±0.055 mas/yr ; Dec.: −17.015±0.057 mas/yr
Parallax (π)	7.9700 ± 0.0674 mas
Distance	409 ± 3 ly ; (125 ± 1 pc)
Absolute magnitude (MV)	−0.68
Details
Mass	3.41 M☉
Radius	16 R☉
Luminosity	191 L☉
Surface gravity (log g)	2.48 cgs
Temperature	4,981 K
Metallicity [Fe/H]	−0.06 dex
Rotational velocity (v sin i)	5.02 km/s
Age	251 Myr
Other designations
	24 Vul, BD+24° 4075, FK5 760, HD 192944, HIP 99951, HR 7753, SAO 88451
Database references
SIMBAD	data

24 Vulpeculae is a single,^[7] yellow-hued star in the northern constellation of Vulpecula. It is faintly visible to the naked eye with an apparent visual magnitude of 5.30.^[2] The distance to this star can be estimated from its annual parallax shift of 7.9700±0.0674,^[1] which yields a separation of roughly 409 light years. It is moving further away with a heliocentric radial velocity of +15 km/s.^[4]

This is an evolved giant star with a stellar classification of G8III,^[2] having exhausted the hydrogen at its core and moved off the main sequence. It is a red clump giant, indicating it is presently on the horizontal branch and is generating energy through helium fusion in its core region.^[8] The interferometry-measured angular diameter of 24 Vul is 1.08±0.02 mas,^[9] which, at its estimated distance, equates to a physical radius of about 16 times the radius of the Sun.^[5]

24 Vulpeculae is about 251^[2] million years old and is spinning with a projected rotational velocity of 5.02 km/s.^[3] It has 3.41 times the mass of the Sun and is radiating 191 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,981 K.^[2] This is the probable (99.4% chance) source of X-ray emission coming from these coordinates.^[10]

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g ^h Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781, S2CID 16258166.
^ ^a ^b ^c Hekker, S.; Meléndez, J. (2007), "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters", Astronomy and Astrophysics, 475 (3): 1003–1009, arXiv:0709.1145, Bibcode:2007A&A...475.1003H, doi:10.1051/0004-6361:20078233, S2CID 10436552.
^ ^a ^b Gontcharov, G. A. (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, S2CID 119231169.
^ ^a ^b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 134\cdot 1.08)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 31.1\cdot R_{\bigodot }\end{aligned}}$
^ "24 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-21.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Valentini, M.; Munari, U. (November 2010), "A spectroscopic survey of faint, high-Galactic-latitude red clump stars. I. The high resolution sample", Astronomy and Astrophysics, 522: A79, arXiv:1007.0207, Bibcode:2010A&A...522A..79V, doi:10.1051/0004-6361/201014870, S2CID 119156545.
^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.