FSR 1716: A New Milky Way Globular Cluster Confirmed Using VVV RR Lyrae Stars
FSR 1716: A New Milky Way Globular Cluster Confirmed Using VVV RR Lyrae Stars
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FSR 1716：使用 VVV RR 天琴座恒星确认了一个新的银河系球状星团
DOI：
10.3847/2041-8213/838/1/l14
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Zoccali
中科院分区：
文献类型：
--
作者：
D. Minniti;T. Palma;I. D'ek'any;M. Hempel;M. Rejkuba;J. Pullen;J. Alonso;R. Barb'a;B. Barbuy;E. Bica;C. Bonatto;J. Borissova;M. Catelán;J. Carballo;A. Chené;J. Clari'a;R. Cohen;Rodrigo Contreras;B. Dias;J. Emerson;D. Froebrich;A. Buckner;D. Geisler;O. Gonzalez;F. Gran;Gergely Hagdu;M. Irwin;V. Ivanov;R. Kurtev;P. Lucas;D. Majaess;F. Mauro;C. Moni;C. Navarrete;S. R. Alegr'ia;R. Saito;E. Valenti;M. Zoccali
我们使用Vía L巡视中Vista变星的深度多历元近红外图像来寻找朝向南银河系平面的R型天琴座恒星。在这里，我们报告了在VVV瓦片d025中发现了一群靠得很近的R型天琴座恒星。对VVV图像和PSF测光的检查表明，这些恒星中的大多数很可能属于一个球状星团，该球状星团与先前已知的星团FSR1716的位置相匹配。该场的恒星密度图为这个候选球状星团提供了a>；100σ探测，该星团的中心位置为赤道坐标R.A.J2000=16：10：30.0Decl.J2000=−53：44：56，银河坐标L=329.77812，b=−1.59227。这颗天体的颜色-星等图显示了一个密集的红色巨型分支，在Ks=13.35±0.05，J−Ks=1.3±0.05处有一个突出的红色团块。我们给出了天琴座RR星团的位置、星等、颜色、周期和幅度。天琴座RR的出现表明了一个古老的球状星团，年龄为10 Gyr。根据天琴座RR型星团的平均周期，我们将该天体归类为OosterhoffI型球状星系团，并认为这是一个相对贫金属的星系团，[Fe/H]=−1.5±0.4Dex。从天琴座RR色和近红外色星等图测得该星系团的平均消光和变红分别为和E(J−Ks)=0.72±0.02mag。我们还使用RR型天琴座AB星来测量星团距离。星团的平均距离模数为(m−M)0=14.38±0.0 3mag，距离D=7.5±0.2kpc，银心距Rg=4.3kpc。
We use deep multi-epoch near-IR images of the VISTA Variables in the Vía Láctea (VVV) Survey to search for RR Lyrae stars toward the Southern Galactic plane. Here, we report the discovery of a group of RR Lyrae stars close together in VVV tile d025. Inspection of the VVV images and PSF photometry reveals that most of these stars are likely to belong to a globular cluster that matches the position of the previously known star cluster FSR 1716. The stellar density map of the field yields a >100σ detection for this candidate globular cluster that is centered at equatorial coordinates R.A.J2000 = 16:10:30.0, decl.J2000 = −53:44:56 and galactic coordinates l = 329.77812, b = −1.59227. The color–magnitude diagram of this object reveals a well-populated red giant branch, with a prominent red clump at Ks = 13.35 ± 0.05, and J − Ks = 1.30 ± 0.05. We present the cluster RR Lyrae positions, magnitudes, colors, periods, and amplitudes. The presence of RR Lyrae indicates an old globular cluster, with an age >10 Gyr. We classify this object as an Oosterhoff type I globular cluster, based on the mean period of its RR Lyrae type ab, days, and argue that this is a relatively metal-poor cluster with [Fe/H] = −1.5 ± 0.4 dex. The mean extinction and reddening for this cluster are and E(J − Ks) = 0.72 ± 0.02 mag, respectively, as measured from the RR Lyrae colors and the near-IR color–magnitude diagram. We also measure the cluster distance using the RR Lyrae type ab stars. The cluster mean distance modulus is (m − M)0 = 14.38 ± 0.03 mag, implying a distance D = 7.5 ± 0.2 kpc and a Galactocentric distance RG = 4.3 kpc.
影响因子：
4.8
作者：
J. Carballo-Bello;S. R. Alegria;J. Borissova;L. Smith;R. Kurtev;P. Lucas;C. M. Bidin;J. Alonso-García;D. Minniti;T. Palma;I. Dékány;N. Medina;M. Moyano;V. Villanueva;M. Kuhn
通讯作者：
J. Carballo-Bello;S. R. Alegria;J. Borissova;L. Smith;R. Kurtev;P. Lucas;C. M. Bidin;J. Alonso-García;D. Minniti;T. Palma;I. Dékány;N. Medina;M. Moyano;V. Villanueva;M. Kuhn
影响因子：
6.5
作者：
R. H. Barbá;A. Roman-Lopes;J. L. N. Castellón;V. Firpo;D. Minniti;P. Lucas;Jim Emerson;M. Hemp
通讯作者：
R. H. Barbá;A. Roman-Lopes;J. L. N. Castellón;V. Firpo;D. Minniti;P. Lucas;Jim Emerson;M. Hemp
NTT 对 FSR 目录中候选星团的后续观测
DOI：
10.1111/j.1365-2966.2008.13849.x
发表时间：
2008
影响因子：
4.8
作者：
Froebrich D
通讯作者：
Froebrich D