This is an aging
giant star with a
stellar classification of K4.5 III.[3] It displays an enhanced abundance of elements generated through the
alpha process, and, in particular, has a strong enhancement of silicon.[13] 29 Herculis is a suspected
variable star of unknown type, and has been measured ranging in visual magnitude from 4.82 down to 4.85.[4] It is an estimated 6.53[6] billion years old with 1.19[6] times the
mass of the Sun. Having exhausted the supply of hydrogen at its
core, it has expanded to 42[7] times the
Sun's radius. The star is radiating 384[7] times the
luminosity of the Sun from its swollen
photosphere at an
effective temperature of 3,958 K.[6]
^
abKeenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245,
Bibcode:
1989ApJS...71..245K,
doi:
10.1086/191373.
^Schiavon, Ricardo P. (July 2007), "Population Synthesis in the Blue. IV. Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations", The Astrophysical Journal Supplement Series, 171 (1): 146–205,
arXiv:astro-ph/0611464,
Bibcode:
2007ApJS..171..146S,
doi:
10.1086/511753,
S2CID13946698.
^Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231,
Bibcode:
2008AJ....135..209M,
doi:10.1088/0004-6256/135/1/209.
^Franchini, M.; et al. (January 2004), "Synthetic Lick Indices and Detection of α-Enhanced Stars", The Astrophysical Journal, 601 (1): 485–499,
Bibcode:
2004ApJ...601..485F,
doi:10.1086/380443.