YSOVAR: MID-INFRARED VARIABILITY OF YOUNG STELLAR OBJECTS AND THEIR DISKS IN THE CLUSTER IRAS 20050+2720

ABSTRACT We present a time-variability study of young stellar objects (YSOs) in the cluster IRAS 20050+2720, performed at 3.6 and 4.5 m with the Spitzer Space Telescope; this study is part of the Young Stellar Object VARiability (YSOVAR) project. We have collected light curves for 181 cluster member...

Full description

Saved in:
Bibliographic Details
Published in:The Astronomical journal 2015-10, Vol.150 (4), p.1-22
Main Authors: Poppenhaeger, K., Cody, A. M., Covey, K. R., Günther, H. M., Hillenbrand, L. A., Plavchan, P., Rebull, L. M., Stauffer, J. R., Wolk, S. J., Espaillat, C., Forbrich, J., Gutermuth, R. A., Hora, J. L., Morales-Calderón, M., Song, Inseok
Format: Article
Language:English
Subjects:
Accretion
ACCRETION DISKS
accretion, accretion disks
Amplitudes
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Clusters
COLOR
DIAGRAMS
infrared: stars
PERIODICITY
protoplanetary disks
PROTOPLANETS
Slopes
SPACE
Space telescopes
STAR CLUSTERS
STARS
stars: pre-main sequence
stars: variables: general
TELESCOPES
Time
Trends
VISIBLE RADIATION
X-rays
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ABSTRACT We present a time-variability study of young stellar objects (YSOs) in the cluster IRAS 20050+2720, performed at 3.6 and 4.5 m with the Spitzer Space Telescope; this study is part of the Young Stellar Object VARiability (YSOVAR) project. We have collected light curves for 181 cluster members over 60 days. We find a high variability fraction among embedded cluster members of ca. 70%, whereas young stars without a detectable disk display variability less often (in ca. 50% of the cases) and with lower amplitudes. We detect periodic variability for 33 sources with periods primarily in the range of 2-6 days. Practically all embedded periodic sources display additional variability on top of their periodicity. Furthermore, we analyze the slopes of the tracks that our sources span in the color-magnitude diagram (CMD). We find that sources with long variability time scales tend to display CMD slopes that are at least partially influenced by accretion processes, while sources with short variability timescales tend to display extinction-dominated slopes. We find a tentative trend of X-ray detected cluster members to vary on longer timescales than the X-ray undetected members.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/150/4/118