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Dynamics of the circumstellar gas in the Herbig Ae stars BF Orionis, SV Cephei, WW Vulpeculae and XY Persei

Mora, A. and Eiroa, C. and Natta, A. and Grady, C. A. and Winter, D. de and Davies, J. K. and Ferlet, R. and Harris, A. W. and Miranda, L. F. and Montesinos, B. and Oudmaijer, R. D. and Palacios, J. and Quirrenbach, A. and Rauer, H. and Alberdi, A. and Cameron, A. and Deeg, H. J. and Garzón, F. and Horne, K. and Merín, B. and Penny, A. and Schneider, J. and Solano, E. and Tsapras, Y. and Wesselius, P. R. (2004) Dynamics of the circumstellar gas in the Herbig Ae stars BF Orionis, SV Cephei, WW Vulpeculae and XY Persei. Astronomy and Astrophysics, 419 (1), pp. 225-240. doi: 10.1051/0004-6361:20040096.

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Abstract

We present high resolution (»/” » = 49 000) échelle spectra of the intermediate mass, pre-main sequence stars BF Ori, SV Cep, WW Wul and XY Per. The spectra cover the range 3800-5900 Å and monitor the stars on time scales of months and days. All spectra show a large number of Balmer and metallic lines with variable blueshifted and redshifted absorption features superimposed to the photospheric stellar spectra. Synthetic Kurucz models are used to estimate rotational velocities, effective temperatures and gravities of the stars. The best photospheric models are subtracted from each observed spectrum to determine the variable absorption features due to the circumstellar gas; those features are characterized in terms of their velocity, v, dispersion velocity, ” v, and residual absorption, Rmax. The absorption components detected in each spectrum can be grouped by their similar radial velocities and are interpreted as the signature of the dynamical evolution of gaseous clumps with, in most cases, solar-like chemical composition. This infalling and outflowing gas has similar properties to the circumstellar gas observed in UX Ori, emphasizing the need for detailed theoretical models, probably in the framework of the magnetospheric accretion scenario, to understand the complex environment in Herbig Ae (HAe) stars. WW Vul is unusual because, in addition to infalling and outflowing gas with properties similar to those observed in the other stars, it shows also transient absorption features in metallic lines with no obvious counterparts in the hydrogen lines. This could, in principle, suggest the presence of CS gas clouds with enhanced metallicity around WW Vul. The existence of such a metal-rich gas component, however, needs to be confirmed by further observations and a more quantitative analysis.

Item URL in elib:https://elib.dlr.de/10963/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Dynamics of the circumstellar gas in the Herbig Ae stars BF Orionis, SV Cephei, WW Vulpeculae and XY Persei
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mora, A.Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Eiroa, C.Visiting Scientist at ESA/ESTEC and Leiden University, The Netherlands; Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Natta, A.Osservatorio Astrofisico die Arcetri, Firenze, ItalyUNSPECIFIEDUNSPECIFIED
Grady, C. A.NOAO/STIS, Goddard Space Flight Center, Greenbelt, MD, USAUNSPECIFIEDUNSPECIFIED
Winter, D. deTNO/TPD-Space Instrumentation, Delft, The NetherlandsUNSPECIFIEDUNSPECIFIED
Davies, J. K.Astronomy Technology Centre, Royal Observatory, Edinburgh, UKUNSPECIFIEDUNSPECIFIED
Ferlet, R.CNRS, Institute d'Astrophysique de Paris, Paris, FranceUNSPECIFIEDUNSPECIFIED
Harris, A. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Miranda, L. F.Instituto de Astrofísisca de Andalucía, Granada, SpainUNSPECIFIEDUNSPECIFIED
Montesinos, B.Instituto de Astrofísisca de Andalucía, Granada, Spain; LAEFF, VILSPA, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Oudmaijer, R. D.Department of Physics and Astronomy, University of Leeds, Leeds, UKUNSPECIFIEDUNSPECIFIED
Palacios, J.Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Quirrenbach, A.(Department of Physics, Center for Astrophysics and Space Sciences, University of California, San Diego, CA, USAUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alberdi, A.Instituto de Astrofísisca de Andalucía, Granada, SpainUNSPECIFIEDUNSPECIFIED
Cameron, A.Physics & Astronomy, University of St. Andrews, St. Andrews, Scotland, UKUNSPECIFIEDUNSPECIFIED
Deeg, H. J.Instituto de Astrofísica de Canarias, Tenerife, SpainUNSPECIFIEDUNSPECIFIED
Garzón, F.Instituto de Astrofísica de Canarias, Tenerife, SpainUNSPECIFIEDUNSPECIFIED
Horne, K.Physics & Astronomy, University of St. Andrews, St. Andrews, Scotland, UKUNSPECIFIEDUNSPECIFIED
Merín, B.LAEFF, VILSPA, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Penny, A.Rutherford Appleton Laboratory, Oxfordshire, UKUNSPECIFIEDUNSPECIFIED
Schneider, J.Observatoire de Paris, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Solano, E.LAEFF, VILSPA, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Tsapras, Y.Physics & Astronomy, University of St. Andrews, St. Andrews, Scotland, UKUNSPECIFIEDUNSPECIFIED
Wesselius, P. R.SRON, Universiteitscomplex "Zernike", Groningen, The NetherlandsUNSPECIFIEDUNSPECIFIED
Date:2004
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:419
DOI:10.1051/0004-6361:20040096
Page Range:pp. 225-240
Status:Published
Keywords:stars: pre-main sequence - stars: circumstellar matter - stars: individual: BF Ori, SV Cep, WW Vul, XY Per
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:Institute of Planetary Research
Deposited By: DLR-Beauftragter, elib
Deposited On:08 Dec 2005
Last Modified:14 Jan 2010 16:34

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