A NEW CATALOG of VARIABLE STARS in the FIELD of the OPEN CLUSTER M37

S. W. Chang, Yong-Ik Byun, J. D. Hartman

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present a comprehensive re-analysis of stellar photometric variability in the field of the open cluster M37 following the application of a new photometry and de-trending method to the MMT/Megacam image archive. This new analysis allows a rare opportunity to explore photometric variability over a broad range of timescales, from minutes to a month. The intent of this work is to examine the entire sample of more than 30,000 objects for periodic, aperiodic, and sporadic behaviors in their light curves. We show a modified version of the fast χ2 periodogram algorithm (Fχ2) and change-point analysis as tools for detecting and assessing the significance of periodic and non-periodic variations. The benefits of our new photometry and analysis methods are evident. A total of 2,306 stars exhibit convincing variations that are induced by flares, pulsations, eclipses, starspots, and unknown causes in some cases. This represents a 60% increase in the number of variables known in this field. Moreover, 30 of the previously identified variables are found to be false positives resulting from time-dependent systematic effects. The new catalog includes 61 eclipsing binary systems, 92 multiperiodic variable stars, 132 aperiodic variables, and 436 flare stars, as well as several hundreds of rotating variables. Based on extended and improved catalog of variables, we investigate the basic properties (e.g., period, amplitude, type) of all variables. The catalog can be accessed through the Web interface (http://stardb.yonsei.ac.kr/).

Original languageEnglish
Article number27
JournalAstronomical Journal
Volume150
Issue number1
DOIs
Publication statusPublished - 2015 Jul 1

Fingerprint

catalogs
photometry
flare stars
starspots
variable stars
open clusters
eclipses
timescale
flares
light curve
analysis
periodic variations
stars
causes
method
effect

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

@article{4ca7bd9533f4433cbdaa5e63ba460c55,
title = "A NEW CATALOG of VARIABLE STARS in the FIELD of the OPEN CLUSTER M37",
abstract = "We present a comprehensive re-analysis of stellar photometric variability in the field of the open cluster M37 following the application of a new photometry and de-trending method to the MMT/Megacam image archive. This new analysis allows a rare opportunity to explore photometric variability over a broad range of timescales, from minutes to a month. The intent of this work is to examine the entire sample of more than 30,000 objects for periodic, aperiodic, and sporadic behaviors in their light curves. We show a modified version of the fast χ2 periodogram algorithm (Fχ2) and change-point analysis as tools for detecting and assessing the significance of periodic and non-periodic variations. The benefits of our new photometry and analysis methods are evident. A total of 2,306 stars exhibit convincing variations that are induced by flares, pulsations, eclipses, starspots, and unknown causes in some cases. This represents a 60{\%} increase in the number of variables known in this field. Moreover, 30 of the previously identified variables are found to be false positives resulting from time-dependent systematic effects. The new catalog includes 61 eclipsing binary systems, 92 multiperiodic variable stars, 132 aperiodic variables, and 436 flare stars, as well as several hundreds of rotating variables. Based on extended and improved catalog of variables, we investigate the basic properties (e.g., period, amplitude, type) of all variables. The catalog can be accessed through the Web interface (http://stardb.yonsei.ac.kr/).",
author = "Chang, {S. W.} and Yong-Ik Byun and Hartman, {J. D.}",
year = "2015",
month = "7",
day = "1",
doi = "10.1088/0004-6256/150/1/27",
language = "English",
volume = "150",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "1",

}

A NEW CATALOG of VARIABLE STARS in the FIELD of the OPEN CLUSTER M37. / Chang, S. W.; Byun, Yong-Ik; Hartman, J. D.

In: Astronomical Journal, Vol. 150, No. 1, 27, 01.07.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A NEW CATALOG of VARIABLE STARS in the FIELD of the OPEN CLUSTER M37

AU - Chang, S. W.

AU - Byun, Yong-Ik

AU - Hartman, J. D.

PY - 2015/7/1

Y1 - 2015/7/1

N2 - We present a comprehensive re-analysis of stellar photometric variability in the field of the open cluster M37 following the application of a new photometry and de-trending method to the MMT/Megacam image archive. This new analysis allows a rare opportunity to explore photometric variability over a broad range of timescales, from minutes to a month. The intent of this work is to examine the entire sample of more than 30,000 objects for periodic, aperiodic, and sporadic behaviors in their light curves. We show a modified version of the fast χ2 periodogram algorithm (Fχ2) and change-point analysis as tools for detecting and assessing the significance of periodic and non-periodic variations. The benefits of our new photometry and analysis methods are evident. A total of 2,306 stars exhibit convincing variations that are induced by flares, pulsations, eclipses, starspots, and unknown causes in some cases. This represents a 60% increase in the number of variables known in this field. Moreover, 30 of the previously identified variables are found to be false positives resulting from time-dependent systematic effects. The new catalog includes 61 eclipsing binary systems, 92 multiperiodic variable stars, 132 aperiodic variables, and 436 flare stars, as well as several hundreds of rotating variables. Based on extended and improved catalog of variables, we investigate the basic properties (e.g., period, amplitude, type) of all variables. The catalog can be accessed through the Web interface (http://stardb.yonsei.ac.kr/).

AB - We present a comprehensive re-analysis of stellar photometric variability in the field of the open cluster M37 following the application of a new photometry and de-trending method to the MMT/Megacam image archive. This new analysis allows a rare opportunity to explore photometric variability over a broad range of timescales, from minutes to a month. The intent of this work is to examine the entire sample of more than 30,000 objects for periodic, aperiodic, and sporadic behaviors in their light curves. We show a modified version of the fast χ2 periodogram algorithm (Fχ2) and change-point analysis as tools for detecting and assessing the significance of periodic and non-periodic variations. The benefits of our new photometry and analysis methods are evident. A total of 2,306 stars exhibit convincing variations that are induced by flares, pulsations, eclipses, starspots, and unknown causes in some cases. This represents a 60% increase in the number of variables known in this field. Moreover, 30 of the previously identified variables are found to be false positives resulting from time-dependent systematic effects. The new catalog includes 61 eclipsing binary systems, 92 multiperiodic variable stars, 132 aperiodic variables, and 436 flare stars, as well as several hundreds of rotating variables. Based on extended and improved catalog of variables, we investigate the basic properties (e.g., period, amplitude, type) of all variables. The catalog can be accessed through the Web interface (http://stardb.yonsei.ac.kr/).

UR - http://www.scopus.com/inward/record.url?scp=84936130168&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84936130168&partnerID=8YFLogxK

U2 - 10.1088/0004-6256/150/1/27

DO - 10.1088/0004-6256/150/1/27

M3 - Article

VL - 150

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 1

M1 - 27

ER -