SPECTRAL ENERGY DISTRIBUTIONS AND AGE ESTIMATES OF 39 GLOBULAR CLUSTERS IN M31

Journal Article · Mon Jun 15 04:00:00 EDT 2009 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/137/6/4884; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21255740

Jun, Ma; Zhou, Fan; De Grijs, Richard; Zhenyu, Wu; Xu, Zhou; Jianghua, Wu; Zhaoji, Jiang

This paper supplements Jiang et al., who studied 172 M31 globular clusters (GCs) and GC candidates from Battistini et al. on the basis of integrated photometric measurements in the Beijing-Arizona-Taiwan-Connecticut (BATC) photometric system. Here, we present multicolor photometric CCD data (in the BATC system) for the remaining 39 M31 GCs and candidates. In addition, the ages of 35 GCs are constrained by comparing our accurate photometry with updated theoretical stellar synthesis models. We use photometric measurements from the Galaxy Evolution Explorer in the far- and near-ultraviolet and Two Micron All Sky Survey infrared JHK{sub s} data, in combination with optical photometry. Except for two clusters, the ages of the other sample GCs are all older than 1 Gyr. Their age distribution shows that most sample clusters are younger than 6 Gyr, with a peak at {approx}3 Gyr, although the 'usual' complement of well-known old GCs (i.e., GCs of similar age as the majority of the Galactic GCs) is present as well.

• OSTI ID: 21255740
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 6 Vol. 137; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
99 GENERAL AND MISCELLANEOUS
CHARGE-COUPLED DEVICES
ENERGY SPECTRA
GALACTIC EVOLUTION
GALAXIES
PHOTOMETRY
STAR CLUSTERS
ULTRAVIOLET RADIATION