Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams

Ricardo P. Schiavon, Emanuele Dalessandro, Sangmo T. Sohn, Robert T. Rood, Robert W. O'Connell, Francesco R. Ferraro, Barbara Lanzoni, Giacomo Beccari, Soo Chang Rey, Jaehyon Rhee, R. Michael Rich, Suk Jin Yoon, Young Wook Lee

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We present Galaxy Evolution Explorer (GALEX) data for 44 Galactic globular clusters (GCs) obtained during three GALEX observing cycles between 2004 and 2008. This is the largest homogeneous data set on the UV photometric properties of Galactic GCs ever collected. The sample selection and photometric analysis are discussed, and color-magnitude diagrams (CMDs) are presented. The blue and intermediate-blue horizontal branch is the dominant feature of the UV CMDs of old Galactic GCs. Our sample is large enough to display the remarkable variety of horizontal branch shapes found in old stellar populations. Other stellar types that are obviously detected are blue stragglers and post-core-He burning stars. The main features of UV CMDs of Galactic GCs are briefly discussed. We establish the locus of post-core-He burning stars in the UV CMD and present a catalog of candidate asymptotic giant branch (AGB), AGB-manqué, post early-AGB, and post-AGB stars within our cluster sample.

Original languageEnglish
Article number121
JournalAstronomical Journal
Volume143
Issue number5
DOIs
Publication statusPublished - 2012 May 1

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color-magnitude diagram
globular clusters
diagram
galaxies
stars
asymptotic giant branch stars
loci
catalogs
cycles

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Schiavon, R. P., Dalessandro, E., Sohn, S. T., Rood, R. T., O'Connell, R. W., Ferraro, F. R., ... Lee, Y. W. (2012). Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams. Astronomical Journal, 143(5), [121]. https://doi.org/10.1088/0004-6256/143/5/121
Schiavon, Ricardo P. ; Dalessandro, Emanuele ; Sohn, Sangmo T. ; Rood, Robert T. ; O'Connell, Robert W. ; Ferraro, Francesco R. ; Lanzoni, Barbara ; Beccari, Giacomo ; Rey, Soo Chang ; Rhee, Jaehyon ; Rich, R. Michael ; Yoon, Suk Jin ; Lee, Young Wook. / Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams. In: Astronomical Journal. 2012 ; Vol. 143, No. 5.
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Schiavon, RP, Dalessandro, E, Sohn, ST, Rood, RT, O'Connell, RW, Ferraro, FR, Lanzoni, B, Beccari, G, Rey, SC, Rhee, J, Rich, RM, Yoon, SJ & Lee, YW 2012, 'Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams', Astronomical Journal, vol. 143, no. 5, 121. https://doi.org/10.1088/0004-6256/143/5/121

Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams. / Schiavon, Ricardo P.; Dalessandro, Emanuele; Sohn, Sangmo T.; Rood, Robert T.; O'Connell, Robert W.; Ferraro, Francesco R.; Lanzoni, Barbara; Beccari, Giacomo; Rey, Soo Chang; Rhee, Jaehyon; Rich, R. Michael; Yoon, Suk Jin; Lee, Young Wook.

In: Astronomical Journal, Vol. 143, No. 5, 121, 01.05.2012.

Research output: Contribution to journalArticle

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AU - O'Connell, Robert W.

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AU - Lanzoni, Barbara

AU - Beccari, Giacomo

AU - Rey, Soo Chang

AU - Rhee, Jaehyon

AU - Rich, R. Michael

AU - Yoon, Suk Jin

AU - Lee, Young Wook

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N2 - We present Galaxy Evolution Explorer (GALEX) data for 44 Galactic globular clusters (GCs) obtained during three GALEX observing cycles between 2004 and 2008. This is the largest homogeneous data set on the UV photometric properties of Galactic GCs ever collected. The sample selection and photometric analysis are discussed, and color-magnitude diagrams (CMDs) are presented. The blue and intermediate-blue horizontal branch is the dominant feature of the UV CMDs of old Galactic GCs. Our sample is large enough to display the remarkable variety of horizontal branch shapes found in old stellar populations. Other stellar types that are obviously detected are blue stragglers and post-core-He burning stars. The main features of UV CMDs of Galactic GCs are briefly discussed. We establish the locus of post-core-He burning stars in the UV CMD and present a catalog of candidate asymptotic giant branch (AGB), AGB-manqué, post early-AGB, and post-AGB stars within our cluster sample.

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Schiavon RP, Dalessandro E, Sohn ST, Rood RT, O'Connell RW, Ferraro FR et al. Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams. Astronomical Journal. 2012 May 1;143(5). 121. https://doi.org/10.1088/0004-6256/143/5/121