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YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15

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YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15. / Wolk, Scott J.; Günther, H. Moritz; Poppenhaeger, Katja; Cody, A. M.; Rebull, L. M.; Forbrich, J.; Gutermuth, R. A.; Hillenbrand, L. A.; Plavchan, P.; Stauffer, J. R.; Covey, K. R.; Song, Inseok.

In: The Astronomical Journal, Vol. 150, No. 5, 12.10.2015.

Research output: Contribution to journalArticlepeer-review

Harvard

Wolk, SJ, Günther, HM, Poppenhaeger, K, Cody, AM, Rebull, LM, Forbrich, J, Gutermuth, RA, Hillenbrand, LA, Plavchan, P, Stauffer, JR, Covey, KR & Song, I 2015, 'YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15', The Astronomical Journal, vol. 150, no. 5. https://doi.org/10.1088/0004-6256/150/5/145

APA

Wolk, S. J., Günther, H. M., Poppenhaeger, K., Cody, A. M., Rebull, L. M., Forbrich, J., Gutermuth, R. A., Hillenbrand, L. A., Plavchan, P., Stauffer, J. R., Covey, K. R., & Song, I. (2015). YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15. The Astronomical Journal, 150(5). https://doi.org/10.1088/0004-6256/150/5/145

Vancouver

Author

Wolk, Scott J. ; Günther, H. Moritz ; Poppenhaeger, Katja ; Cody, A. M. ; Rebull, L. M. ; Forbrich, J. ; Gutermuth, R. A. ; Hillenbrand, L. A. ; Plavchan, P. ; Stauffer, J. R. ; Covey, K. R. ; Song, Inseok. / YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15. In: The Astronomical Journal. 2015 ; Vol. 150, No. 5.

Bibtex

@article{78e6e664092e462fb3111b52a76a7c0d,
title = "YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15",
abstract = "We present an IR-monitoring survey with the $Spitzer$ Space Telescope of the star forming region GGD 12-15. Over 1000 objects were monitored including about 350 objects within the central 5 arcminutes which is found to be especially dense in cluster members. The monitoring took place over 38 days and is part of the Young Stellar Object VARiability (YSOVAR) project. The region was also the subject of a contemporaneous 67ks $Chandra$ observation. The field includes 119 previously identified pre-main sequence star candidates. X-rays are detected from 164 objects, 90 of which are identified with cluster members. Overall, we find that about half the objects in the central 5 arcminutes are young stellar objects based on a combination of their spectral energy distribution, IR variability and X-ray emission. Most of the stars with IR excess relative to a photosphere show large amplitude (>0.1 mag) mid-IR variability. There are 39 periodic sources, all but one of these is found to be a cluster member. Almost half of the periodic sources do not show IR excesses. Overall, more than 85% of the Class I, flat spectrum, and Class II sources are found to vary. The amplitude of the variability is larger in more embedded young stellar objects. Most of the Class~I/II objects exhibit redder colors in a fainter state, compatible with time-variable extinction. A few become bluer when fainter, which can be explained with significant changes in the structure of the inner disk. A search for changes in the IR due to X-ray events is carried out, but the low number of flares prevented an analysis of the direct impact of X-ray flares on the IR lightcurves. However, we find that X-ray detected Class II sources have longer timescales for change in the mid-IR than a similar set of non-X-ray detected Class IIs.",
keywords = "astro-ph.SR",
author = "Wolk, {Scott J.} and G{\"u}nther, {H. Moritz} and Katja Poppenhaeger and Cody, {A. M.} and Rebull, {L. M.} and J. Forbrich and Gutermuth, {R. A.} and Hillenbrand, {L. A.} and P. Plavchan and Stauffer, {J. R.} and Covey, {K. R.} and Inseok Song",
note = "S. J. Wolk, et al., “YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15”, The Astronomical Journal, Vol. 150(5), October 2015. {\textcopyright} 2015. The American Astronomical Society. All rights reserved.",
year = "2015",
month = oct,
day = "12",
doi = "10.1088/0004-6256/150/5/145",
language = "English",
volume = "150",
journal = "The Astronomical Journal ",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "5",

}

RIS

TY - JOUR

T1 - YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15

AU - Wolk, Scott J.

AU - Günther, H. Moritz

AU - Poppenhaeger, Katja

AU - Cody, A. M.

AU - Rebull, L. M.

AU - Forbrich, J.

AU - Gutermuth, R. A.

AU - Hillenbrand, L. A.

AU - Plavchan, P.

AU - Stauffer, J. R.

AU - Covey, K. R.

AU - Song, Inseok

N1 - S. J. Wolk, et al., “YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15”, The Astronomical Journal, Vol. 150(5), October 2015. © 2015. The American Astronomical Society. All rights reserved.

PY - 2015/10/12

Y1 - 2015/10/12

N2 - We present an IR-monitoring survey with the $Spitzer$ Space Telescope of the star forming region GGD 12-15. Over 1000 objects were monitored including about 350 objects within the central 5 arcminutes which is found to be especially dense in cluster members. The monitoring took place over 38 days and is part of the Young Stellar Object VARiability (YSOVAR) project. The region was also the subject of a contemporaneous 67ks $Chandra$ observation. The field includes 119 previously identified pre-main sequence star candidates. X-rays are detected from 164 objects, 90 of which are identified with cluster members. Overall, we find that about half the objects in the central 5 arcminutes are young stellar objects based on a combination of their spectral energy distribution, IR variability and X-ray emission. Most of the stars with IR excess relative to a photosphere show large amplitude (>0.1 mag) mid-IR variability. There are 39 periodic sources, all but one of these is found to be a cluster member. Almost half of the periodic sources do not show IR excesses. Overall, more than 85% of the Class I, flat spectrum, and Class II sources are found to vary. The amplitude of the variability is larger in more embedded young stellar objects. Most of the Class~I/II objects exhibit redder colors in a fainter state, compatible with time-variable extinction. A few become bluer when fainter, which can be explained with significant changes in the structure of the inner disk. A search for changes in the IR due to X-ray events is carried out, but the low number of flares prevented an analysis of the direct impact of X-ray flares on the IR lightcurves. However, we find that X-ray detected Class II sources have longer timescales for change in the mid-IR than a similar set of non-X-ray detected Class IIs.

AB - We present an IR-monitoring survey with the $Spitzer$ Space Telescope of the star forming region GGD 12-15. Over 1000 objects were monitored including about 350 objects within the central 5 arcminutes which is found to be especially dense in cluster members. The monitoring took place over 38 days and is part of the Young Stellar Object VARiability (YSOVAR) project. The region was also the subject of a contemporaneous 67ks $Chandra$ observation. The field includes 119 previously identified pre-main sequence star candidates. X-rays are detected from 164 objects, 90 of which are identified with cluster members. Overall, we find that about half the objects in the central 5 arcminutes are young stellar objects based on a combination of their spectral energy distribution, IR variability and X-ray emission. Most of the stars with IR excess relative to a photosphere show large amplitude (>0.1 mag) mid-IR variability. There are 39 periodic sources, all but one of these is found to be a cluster member. Almost half of the periodic sources do not show IR excesses. Overall, more than 85% of the Class I, flat spectrum, and Class II sources are found to vary. The amplitude of the variability is larger in more embedded young stellar objects. Most of the Class~I/II objects exhibit redder colors in a fainter state, compatible with time-variable extinction. A few become bluer when fainter, which can be explained with significant changes in the structure of the inner disk. A search for changes in the IR due to X-ray events is carried out, but the low number of flares prevented an analysis of the direct impact of X-ray flares on the IR lightcurves. However, we find that X-ray detected Class II sources have longer timescales for change in the mid-IR than a similar set of non-X-ray detected Class IIs.

KW - astro-ph.SR

U2 - 10.1088/0004-6256/150/5/145

DO - 10.1088/0004-6256/150/5/145

M3 - Article

VL - 150

JO - The Astronomical Journal

JF - The Astronomical Journal

SN - 0004-6256

IS - 5

ER -