J/A+A/313/129 Positions and magnitudes of M30 blue stars (Burgarella+ 1996)
Stellar populations and color gradients in the post core collapse
globular cluster M30
Burgarella D., Buat V.
<Astron. Astrophys. 313, 129 (1996)>
=1996A&A...313..129B 1996A&A...313..129B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Stars, blue
Keywords: globular cluster: individual: Messier 30 - stars: population II -
stars: evolution
Abstract:
Sub-arcsec B and V images of the central 2.5arcmin of the
post-core-collapse globular cluster M 30 are used to study the stellar
populations lying in the central parts of this cluster and to analyze
the influence of the stellar content on the radial color gradient
reported for this cluster. We find a populated blue horizontal branch
which follows a flat radial distribution. The red giants (defined as
the objects above the horizontal branch in this paper) are found to be
depleted relatively to the other bright detected stellar populations.
A highly concentrated population of 42 blue stragglers has also been
detected. The presence of a B-V color gradient (0.20-0.24mag/dex) is
confirmed. A blueing is detectable from the cluster center out to the
edge of the images at r≃1arcmin. None of the detected bright stellar
populations (red giant branch, horizontal branch, asymptotic giant
branch and blue straggler stars) is found to be at the origin of this
gradient. This result suggests that the stellar population(s)
responsible for this gradient has still to be identified. Some
plausible candidates are tentatively proposed in this paper.
Objects:
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RA (2000) DE Designation(s)
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21 40.3 -23 11 M 30 = NGC 7099 = C 2137-234
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 36 103 Positions and magnitudes of the detected
blue horizontal branch stars
table2 36 42 Positions and magnitudes of the detected
blue straggler stars
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Byte-by-byte Description of file: table1 table2
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Identification number of the star
6- 11 F6.2 arcsec Xpos X position relative to our center (see paper)
13- 18 F6.2 arcsec Ypos Y position relative to our center (see paper)
20- 24 F5.2 arcsec Rpos Radial distance to our center (see paper)
26- 30 F5.2 mag Vmag V magnitude
32- 36 F5.2 mag B-V B-V color
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Courtesy: Denis Burgarella
(End) Patricia Bauer [CDS] 10-Apr-1996