Research output: Contribution to journal › Article › peer-review
Investigating the origin and spectroscopic variability of the near-infrared HI lines in the Herbig star VV Ser. / Lopez, Rebeca Garcia; Kurosawa, Ryuichi; Garatti o Carattio, Alessio; Kreplin, Alexander; Weigelt, Gerd; Tambovtseva, Larisa V.; Grinin, Vladimir P.; Ray, Thomas P.
In: Monthly Notices of the Royal Astronomical Society, Vol. 456, No. 1, 11.02.2016, p. 156-170.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Investigating the origin and spectroscopic variability of the near-infrared HI lines in the Herbig star VV Ser
AU - Lopez, Rebeca Garcia
AU - Kurosawa, Ryuichi
AU - Garatti o Carattio, Alessio
AU - Kreplin, Alexander
AU - Weigelt, Gerd
AU - Tambovtseva, Larisa V.
AU - Grinin, Vladimir P.
AU - Ray, Thomas P.
N1 - Publisher Copyright: © 2015 The Authors.
PY - 2016/2/11
Y1 - 2016/2/11
N2 - The origin of the near-infrared (NIR) HI emission lines in young stellar objects are not yet understood. To probe it, we present multi-epoch LBT-LUCIFER spectroscopic observations of the Paδ, Paβ, and Brγ lines observed in the Herbig star VV Ser, along with Very Large Telescope Interferometer-AMBER Br? spectro-interferometric observations at medium resolution. Our spectroscopic observations show line profile variability in all the HI lines. The strongest variability is observed in the redshifted part of the line profiles. The Br? spectrointerferometric observations indicate that the Br? line emitting region is smaller than the continuum emitting region. To interpret our results, we employed radiative transfer models with three different flow configurations: magnetospheric accretion, a magnetocentrifugally driven disc wind, and a schematic bipolar outflow. Our models suggest that the HI line emission inVVSer is dominated by the contribution of an extended wind, perhaps a bipolar outflow. Although the exact physical process for producing such outflow is not known, this model is capable of reproducing the averaged single-peaked line profiles of the HI lines. Additionally, the observed visibilities, differential and closure phases are best reproduced when a wind is considered. Nevertheless, the complex line profiles and variability could be explained by changes in the relative contribution of the magnetosphere and/or winds to the line emission. This might indicate that the NIR HI lines are formed in a complex inner disc region where inflow and outflow components might coexist. Furthermore, the contribution of each of these mechanisms to the line appears time variable, suggesting a non-steady accretion/ejection flow.
AB - The origin of the near-infrared (NIR) HI emission lines in young stellar objects are not yet understood. To probe it, we present multi-epoch LBT-LUCIFER spectroscopic observations of the Paδ, Paβ, and Brγ lines observed in the Herbig star VV Ser, along with Very Large Telescope Interferometer-AMBER Br? spectro-interferometric observations at medium resolution. Our spectroscopic observations show line profile variability in all the HI lines. The strongest variability is observed in the redshifted part of the line profiles. The Br? spectrointerferometric observations indicate that the Br? line emitting region is smaller than the continuum emitting region. To interpret our results, we employed radiative transfer models with three different flow configurations: magnetospheric accretion, a magnetocentrifugally driven disc wind, and a schematic bipolar outflow. Our models suggest that the HI line emission inVVSer is dominated by the contribution of an extended wind, perhaps a bipolar outflow. Although the exact physical process for producing such outflow is not known, this model is capable of reproducing the averaged single-peaked line profiles of the HI lines. Additionally, the observed visibilities, differential and closure phases are best reproduced when a wind is considered. Nevertheless, the complex line profiles and variability could be explained by changes in the relative contribution of the magnetosphere and/or winds to the line emission. This might indicate that the NIR HI lines are formed in a complex inner disc region where inflow and outflow components might coexist. Furthermore, the contribution of each of these mechanisms to the line appears time variable, suggesting a non-steady accretion/ejection flow.
KW - Circumstellar matter
KW - Infrared: stars
KW - Stars: protostars
KW - Stars: variables: T Tauri, Herbig Ae/Be
KW - Stars: winds, outflows
KW - Techniques: interferometric
UR - http://www.scopus.com/inward/record.url?scp=84959498156&partnerID=8YFLogxK
U2 - 10.1093/mnras/stv2664
DO - 10.1093/mnras/stv2664
M3 - Article
AN - SCOPUS:84959498156
VL - 456
SP - 156
EP - 170
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -
ID: 87426134