Red clump giant star in the constellation Vulpecula
24 Vulpeculae is a single, 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. The distance to this star can be estimated from its annual parallax shift of 7.9700±0.0674, which yields a separation of roughly 409 light years . It is moving further away with a heliocentric radial velocity of +15 km/s.
This is an evolved giant star with a stellar classification of G8III, 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 . The interferometry -measured angular diameter of 24 Vul is 1.08±0.02 mas, which, at its estimated distance, equates to a physical radius of about 16 times the radius of the Sun .
24 Vulpeculae is about 251 million years old and is spinning with a projected rotational velocity of 5.02 km/s. 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. This is the probable (99.4% chance) source of X-ray emission coming from these coordinates.
References
^ 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 .doi :10.1051/0004-6361/202039657e ). Gaia EDR3 record for this source at VizieR .
^ 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 .
^ 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 .
^ 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 .
^ Lang, Kenneth R. (2006), Astrophysical formulae Birkhäuser , ISBN 3-540-29692-1 . The radius (R* ) is given by:
2
⋅
R
∗
=
(
10
−
3
⋅
134
⋅
1.08
)
AU
0.0046491
AU
/
R
⨀
≈
31.1
⋅
R
⨀
{\displaystyle {\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 .
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