skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Variable stars in metal-rich globular clusters. IV. Long-period variables in NGC 6496

Abstract

We present VI-band photometry for stars in the metal-rich globular cluster NGC 6496. Our time-series data were cadenced to search for long-period variables (LPVs) over a span of nearly two years, and our variability search yielded the discovery of 13 new variable stars, of which 6 are LPVs, 2 are suspected LPVs, and 5 are short-period eclipsing binaries. An additional star was found in the ASAS database, and we clarify its type and period. We argue that all of the eclipsing binaries are field stars, while five to six of the LPVs are members of NGC 6496. We compare the period–luminosity distribution of these LPVs with those of LPVs in the Large Magellanic Cloud and 47 Tucanae, and with theoretical pulsation models. We also present a VI color–magnitude diagram, display the evolutionary states of the variables, and match isochrones to determine a reddening of E(B−V)= 0.21±0.02 mag and apparent distance modulus of 15.60±0.15 mag.

Authors:
 [1]; ;  [2]; ; ; ; ;  [3];  [4]
  1. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, D-69120 Heidelberg (Germany)
  2. Physics and Astronomy Department, Bowling Green State University, Bowling Green, OH 43403 (United States)
  3. Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599 (United States)
  4. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8 S 4M1 (Canada)
Publication Date:
OSTI Identifier:
22342142
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 149; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; COMPARATIVE EVALUATIONS; DISTANCE; DISTRIBUTION; ECLIPSE; LUMINOSITY; MAGELLANIC CLOUDS; METALS; PHOTOMETRY; PULSATIONS; STAR CLUSTERS; VARIABLE STARS

Citation Formats

Abbas, Mohamad A., Layden, Andrew C., Guldenschuh, Katherine A., Reichart, D. E., Ivarsen, K. M., Haislip, J. B., Nysewander, M. C., LaCluyze, A. P., and Welch, Douglas L., E-mail: mabbas@ari.uni-heidelberg.de, E-mail: laydena@bgsu.edu. Variable stars in metal-rich globular clusters. IV. Long-period variables in NGC 6496. United States: N. p., 2015. Web. doi:10.1088/0004-6256/149/2/40.
Abbas, Mohamad A., Layden, Andrew C., Guldenschuh, Katherine A., Reichart, D. E., Ivarsen, K. M., Haislip, J. B., Nysewander, M. C., LaCluyze, A. P., & Welch, Douglas L., E-mail: mabbas@ari.uni-heidelberg.de, E-mail: laydena@bgsu.edu. Variable stars in metal-rich globular clusters. IV. Long-period variables in NGC 6496. United States. doi:10.1088/0004-6256/149/2/40.
Abbas, Mohamad A., Layden, Andrew C., Guldenschuh, Katherine A., Reichart, D. E., Ivarsen, K. M., Haislip, J. B., Nysewander, M. C., LaCluyze, A. P., and Welch, Douglas L., E-mail: mabbas@ari.uni-heidelberg.de, E-mail: laydena@bgsu.edu. Sun . "Variable stars in metal-rich globular clusters. IV. Long-period variables in NGC 6496". United States. doi:10.1088/0004-6256/149/2/40.
@article{osti_22342142,
title = {Variable stars in metal-rich globular clusters. IV. Long-period variables in NGC 6496},
author = {Abbas, Mohamad A. and Layden, Andrew C. and Guldenschuh, Katherine A. and Reichart, D. E. and Ivarsen, K. M. and Haislip, J. B. and Nysewander, M. C. and LaCluyze, A. P. and Welch, Douglas L., E-mail: mabbas@ari.uni-heidelberg.de, E-mail: laydena@bgsu.edu},
abstractNote = {We present VI-band photometry for stars in the metal-rich globular cluster NGC 6496. Our time-series data were cadenced to search for long-period variables (LPVs) over a span of nearly two years, and our variability search yielded the discovery of 13 new variable stars, of which 6 are LPVs, 2 are suspected LPVs, and 5 are short-period eclipsing binaries. An additional star was found in the ASAS database, and we clarify its type and period. We argue that all of the eclipsing binaries are field stars, while five to six of the LPVs are members of NGC 6496. We compare the period–luminosity distribution of these LPVs with those of LPVs in the Large Magellanic Cloud and 47 Tucanae, and with theoretical pulsation models. We also present a VI color–magnitude diagram, display the evolutionary states of the variables, and match isochrones to determine a reddening of E(B−V)= 0.21±0.02 mag and apparent distance modulus of 15.60±0.15 mag.},
doi = {10.1088/0004-6256/149/2/40},
journal = {Astronomical Journal (New York, N.Y. Online)},
number = 2,
volume = 149,
place = {United States},
year = {Sun Feb 01 00:00:00 EST 2015},
month = {Sun Feb 01 00:00:00 EST 2015}
}