Probing the origin of UX Ori-type variability in the YSO binary CO Ori with VLTI/GRAVITY
Probing the origin of UX Ori-type variability in the YSO binary CO Ori with VLTI/GRAVITY
复制标题
利用 VLTI/GRAVITY 探测 YSO 二元 CO Ori 中 UX Ori 类型变异的起源
DOI:
10.1093/mnras/stx3150
复制
发表时间:
2018
影响因子:
4.8
通讯作者:
Davies C
中科院分区:
文献类型:
--
作者:
Davies C
The primary star in the young stellar object binary CO Ori displays UX Ori-type variability: irregular, high amplitude optical, and near-infrared photometric fluctuations where flux minima coincide with polarization maxima. This is attributed to changes in local opacity. In CO Ori A, these variations exhibit a 12.4 yr cycle. Here, we investigate the physical origin of the fluctuating opacity and its periodicity using interferometric observations of CO Ori obtained using VLTI/GRAVITY. ContinuumK-band circum-primary and circum-secondary emission are marginally spatially resolved for the first time, while Brγ emission is detected in the spectrum of the secondary. We estimate a spectral type range for CO Ori B of K2–K5 assuming visual extinction,AV= 2 and a distance of 430 pc. From geometric modelling of the continuum visibilities, the circum-primary emission is consistent with a central point source plus a Gaussian component with a full width at half-maximum of 2.31 ± 0.04 mas, inclined at 30.2° ± 2.2° and with a major axis position angle of 40° ± 6°. This inclination is lower than that reported for the discs of other UX Ori-type stars, providing a first indication that the UX Ori phenomena may arise through fluctuations in circum-stellar material exterior to a disc, for example, in a dusty outflow. An additional wide, symmetric Gaussian component is required to fit the visibilities of CO Ori B, signifying a contribution from scattered light. Finally, closure phases of CO Ori A were used to investigate whether the 12.4 yr periodicity is associated with an undetected third component, as has been previously suggested. We rule out any additional companions contributing more than 3.6 per cent to theK-band flux within ∼7.3–20 mas of CO Ori A.
登录
查看更多内容
影响因子:
6.5
作者:
G. C. R. Abuter;M. Accardo;A. Amorim;N. Anugu;G. Ávila;N. Azouaoui;M. Benisty;J. Berger;N. Bl
通讯作者:
G. C. R. Abuter;M. Accardo;A. Amorim;N. Anugu;G. Ávila;N. Azouaoui;M. Benisty;J. Berger;N. Bl
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
L. Tambovtseva;V. Grinin
通讯作者:
V. Grinin
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
J. L. Bouquin;J. Berger;B. Lazareff;G. Zins;P. Haguenauer;L. Jocou;P. Kern;R. Millan;W. Traub;O. Absil;J. Augereau;M. Benisty;N. Blind;X. Bonfils;P. Bourget;A. Delboulbé;P. Feautrier;M. Germain;P. Gitton;D. Gillier;M. Kiekebusch;J. Kluska;J. Knudstrup;P. Labeye;J. Lizon;J. Monin;Y. Magnard;F. Malbet;D. Maurel;F. Ménard;M. Micallef;L. Michaud;G. Montagnier;S. Morel;T. Moulin;K. Perraut;D. Popovic;P. Rabou;S. Rochat;C. Rojas;F. Roussel;A. Roux;E. Stadler;S. Štefl;E. Tatulli;N. Ventura
通讯作者:
N. Ventura
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
V. Shenavrin;A. N. Rostopchina;V. Grinin;T. Demidova;D. Shakhovskoi;S. P. Belan
通讯作者:
S. P. Belan
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
A. Kreplin;G. Weigelt;S. Kraus;V. Grinin;K. Hofmann;M. Kishimoto;D. Schertl;L. Tambovtseva;J. Clausse;F. Massi;K. Perraut;P. Stee
通讯作者:
P. Stee