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On the simultaneous optical and near-infrared variability of pre-main sequence stars

Eiroa, C. and Oudmaijer, R. D. and Davies, J. K. and de Winter, D. and Garzon, F. and Palacios, J. and Alberdi, A. and Ferlet, R. and Grady, C. A. and Cameron, A. and Deeg, H. J. and Harris, A. W. and Horne, K. and Merin, B. and Miranda, L. F. and Montesinos, B. and Mora, A. and Penny, A. and Quirrenbach, A. and Rauer, H. and Schneider, J. and Solano, E. and Tsapras, Y. and Wesselius, P. R. (2002) On the simultaneous optical and near-infrared variability of pre-main sequence stars. Astronomy and Astrophysics, 384, pp. 1038-1049.

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Abstract

For a complete understanding of the physical processes causing the photometric variability of pre-main sequence systems, simultaneous optical and near-IR observations are required to disentangle the emission from the stars and that from their associated circumstellar disks. Data of this sort are extremely rare and little systematic work has been reported to date. The work presented in this paper is a systematic attempt in this direction. It presents an analysis of the simultaneous optical and near-IR photometric variability of 18 Herbig Ae/Be and T Tauri stars which were observed in October 98 by the EXPORT collaboration. The time difference between the UBVRI and JHK measurements is less than 1 hour in 50% of the data and the largest difference is around 2 hours in only 10% of the data. Twelve stars appear to show a correlation between the optical and near-IR variability trends, which suggests a common physical origin such as spots and/or variable extinction. The optical and near-IR variability is uncorrelated in the rest of the objects, which suggests it originates in distinctly different regions. In general, the optical variability qualitatively follows the predictions of starspots or variable extinction. As far as the near-IR is concerned, the simultaneity of the observations demonstrates that for most objects the flux is largely produced by their circumstellar disks and, consequently, in many cases the near-IR fluctuations must be attributed to structural variations of such disks producing variations of their thermal emission and/or scattered light. The observed near-IR changes of up to around 1 mag on timescales of 1-2 days provide interesting challenges for understanding the mechanisms generating such remarkable variabilities, an issue insufficiently investigated until now but one which deserves further theoretical and modeling efforts.

Item URL in elib:https://elib.dlr.de/18232/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2001,
Title:On the simultaneous optical and near-infrared variability of pre-main sequence stars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Eiroa, C.Dpto. Física Teórica, C-XI, Facultad de Ciencieas, Universidad Autónoma de Madrid, Cantoblanco, Madrid, SpainUNSPECIFIED
Oudmaijer, R. D.Department of Physics and Astronomy, University of Leeds, Leeds, UKUNSPECIFIED
Davies, J. K.Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh, UKUNSPECIFIED
de Winter, D.TNO/TPD-Space Instrumentation, Delft, The NetherlandsUNSPECIFIED
Garzon, F.Instituto de Astrofísica de Canarias, La Laguna, Tenerife, SpainUNSPECIFIED
Palacios, J.Dpto. Física Teórica, C-XI, Facultad de Ciencieas, Universidad Autónoma de Madrid, Cantoblanco, Madrid, SpainUNSPECIFIED
Alberdi, A.Instituto de Astrofísica de Andalucía, Granada, SpainUNSPECIFIED
Ferlet, R.CNRS, Institut d'Astrophysique de Paris, Paris, FranceUNSPECIFIED
Grady, C. A.NOAO/STIS, Goddard Space Flight Center, Greenbelt, MD, USAUNSPECIFIED
Cameron, A.Physics & Astronomy, University of St. Andrews, St. Andrews, Scotland, UKUNSPECIFIED
Deeg, H. J.Instituto de Astrofísica de Canarias, La Laguna, Tenerife, SpainUNSPECIFIED
Harris, A. W.UNSPECIFIEDUNSPECIFIED
Horne, K.Physics & Astronomy, University of St. Andrews, St. Andrews, Scotland, UKUNSPECIFIED
Merin, B.L.A.E.F.F., VILSPA, Madrid, SpainUNSPECIFIED
Miranda, L. F.Instituto de Astrofísica de Andalucía, Granada, SpainUNSPECIFIED
Montesinos, B.L.A.E.F.F., VILSPA, Madrid, SpainUNSPECIFIED
Mora, A.Dpto. Física Teórica, C-XI, Facultad de Ciencieas, Universidad Autónoma de Madrid, Cantoblanco, Madrid, SpainUNSPECIFIED
Penny, A.Rutherford Appleton Laboratory, Didcot, Oxfordshire, UKUNSPECIFIED
Quirrenbach, A.Department of Physics, Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA, USAUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIED
Schneider, J.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Solano, E.L.A.E.F.F., VILSPA, Madrid, SpainUNSPECIFIED
Tsapras, Y.Physics & Astronomy, University of St. Andrews, St. Andrews, Scotland, UKUNSPECIFIED
Wesselius, P. R.SRON Universiteitscomplex "Zernike", Groningen, The NetherlandsUNSPECIFIED
Date:2002
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:384
Page Range:pp. 1038-1049
Status:Published
Keywords:stars formation, stars pre-main sequence, stars variables general, stars circumstellar matter, accretion, accretion disks
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institut für Weltraumsensorik und Planetenerkundung
Deposited By: DLR-Beauftragter, elib
Deposited On:08 Dec 2005
Last Modified:14 Jan 2010 18:57

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