Rotationally modulated variations and the mean longitudinal magnetic field of the Herbig Ae star HD 101412

Hubrig, S.; Mikulášek, Zdeněk; González, J. F.; Schöller, M.; Ilyin, I.; Curé, M.; Zejda, Miloslav; Cowley, Charles R.; Elkin, V. G.; Погодин, М. А.; Yudin, R. V.

doi:10.1051/0004-6361/201015806

Cited by 41 publications

(82 citation statements)

References 19 publications

(19 reference statements)

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“…The spectra have a resolving power of about R = 115 000 and cover the spectral range 3780-6910 Å, with a small gap between 5259 and 5337 Å. The Hubrig et al (2011b).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

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HARPS spectropolarimetry of three sharp-lined Herbig Ae stars: New insights

Järvinen

Carroll

Hubrig

et al. 2015

A&A

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Aims. Recently, several arguments have been presented that favour a scenario in which the low detection rate of magnetic fields in Herbig Ae stars can be explained by the weakness of these fields and rather large measurement uncertainties. Spectropolarimetric studies involving sharp-lined Herbig Ae stars appear to be a promising approach for the detection of such weak magnetic fields. These studies offer a clear spectrum interpretation with respect to the effects of blending, local velocity fields, and chemical abundances, and allow us to identify a proper sample of spectral lines appropriate for magnetic field determination. Methods. High-resolution spectropolarimetric observations of the three sharp-lined (v sin i < 15 km s −1 ) Herbig Ae stars HD 101412, HD 104237, and HD 190073 have been obtained in recent years with the HARPS spectrograph in polarimetric mode. We used these archival observations to investigate the behaviour of their longitudinal magnetic fields. To carry out the magnetic field measurements, we used the multi-line singular value decomposition (SVD) method for Stokes profile reconstruction. Results. We carried out a high-resolution spectropolarimetric analysis of the Herbig Ae star HD 101412 for the first time. We discovered that different line lists yield differences in both the shape of the Stokes V signatures and their field strengths. They could be interpreted in the context of the impact of the circumstellar matter and elemental abundance inhomogeneities on the measurements of the magnetic field. On the other hand, due to the small size of the Zeeman features on the first three epochs and the lack of near-IR observations, circumstellar and photospheric contributions cannot be estimated unambiguously. In the SVD Stokes V spectrum of the SB2 system HD 104237, we detect that the secondary component, which is a T Tauri star, possesses a rather strong magnetic field B z = 129 ± 12 G, while no significant field is present in the primary component. Our measurements of HD 190073 confirm the presence of a variable magnetic field and indicate that the circumstellar environment may have a significant impact on the observed polarization features.

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“…The spectra have a resolving power of about R = 115 000 and cover the spectral range 3780-6910 Å, with a small gap between 5259 and 5337 Å. The Hubrig et al (2011b).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

“…Wade et al 2005Wade et al , 2007Hubrig et al 2009Hubrig et al , 2010Hubrig et al , 2011b. The fundamental parameters, T eff = 8300 K and log g = 3.8, and the projected rotation velocity, v sin i = 3 ± 2 km s −1 , were determined by Cowley et al (2010).…”

Section: Hd 101412mentioning

confidence: 99%

HARPS spectropolarimetry of three sharp-lined Herbig Ae stars: New insights

Järvinen

Carroll

Hubrig

et al. 2015

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“…Praderie et al 1986;Catala et al 1986). Hubrig et al (2011) we determine the rotation period of the Herbig star HD 135344B by measuring radial velocity variations using multi-epoch high resolution optical spectra.…”

Section: Introductionmentioning

confidence: 99%

HD 135344B: a young star has reached its rotational limit

Müller

Ancker

Launhardt

et al. 2011

A&A

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Aims. We search for periodic variations in the radial velocity of the young Herbig star HD 135344B to determine a rotation period. Methods. We analyze 44 high-resolution optical spectra taken over a time period of 151 days. The spectra were acquired with FEROS at the 2.2 m MPG/ESO telescope in La Silla. The stellar parameters of HD 135344B are determined by fitting synthetic spectra to the stellar spectrum. To obtain radial velocity measurements, the stellar spectra are cross-correlated with a theoretical template computed from determined stellar parameters. Results. We report the first direct measurement of the rotation period of a Herbig star from radial velocity measurements. The rotation period is found to be 0.16 d (3.9 h), which makes HD 135344B a rapid rotator at or close to its break-up velocity. The rapid rotation could explain some of the properties of the circumstellar environment of HD 135344B such as an inner disk with properties (composition, inclination) that differ significantly from the outer disk.

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“…The epoch MJD 52 797.4 corresponds to phase ϕ = 0, as presented in Fig. 4 of Hubrig et al (2011). Synthetic Paγ profiles assuming the atmospheric parameters T eff = 8300 K and log g = 3.8 are indicated by the dotted lines.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

“…HD 101412 rotates very slowly, with a projected rotation velocity of v sin i ≈ 3 km s −1 (Cowley et al 2010). Using the stellar fundamental parameters and the detected magnetic rotation period of P m = 42 d .076 ± 0 d .017, the inclination angle of the rotation axis relative to the line-of-sight was estimated as i = 80 ± 7 • , and the angle between the magnetic and the rotation axis was determined as β = 84 ± 13 • (Hubrig et al 2011). This means that the magnetic axis lies close to the plane of the equatorial disk, and that the regions close to the magnetic poles, where the accreted matter falls onto the star, intersect the line-of-sight two times during one rotation period.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic signatures of magnetospheric accretion in Herbig Ae/Be stars

Schöller

Погодин

Cahuasquí

et al. 2016

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Context. Models of magnetically-driven accretion and outflows reproduce many observational properties of T Tauri stars. This concept is not well established for the more massive Herbig Ae/Be stars. Aims. We intend to examine the magnetospheric accretion in Herbig Ae/Be stars and search for rotational modulation using spectroscopic signatures, in this first paper concentrating on the well-studied Herbig Ae star HD 101412. Methods. We used near-infrared spectroscopic observations of the magnetic Herbig Ae star HD 101412 to test the magnetospheric character of its accretion disk/star interaction. We reduced and analyzed 30 spectra of HD 101412, acquired with the CRIRES and X-shooter spectrographs installed at the VLT (ESO, Chile). The spectroscopic analysis was based on the He i λ10 830 and Paγ lines, formed in the accretion region. Results. We found that the temporal behavior of these diagnostic lines in the near-infrared spectra of HD 101412 can be explained by rotational modulation of line profiles generated by accreting gas with a period P = 20 d .53 ± 1 d .68. The discovery of this period, about half of the magnetic rotation period P m = 42 d .076 previously determined from measurements of the mean longitudinal magnetic field, indicates that the accreted matter falls onto the star in regions close to the magnetic poles intersecting the line-of-sight two times during the rotation cycle. We intend to apply this method to a larger sample of Herbig Ae/Be stars.

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Rotationally modulated variations and the mean longitudinal magnetic field of the Herbig Ae star HD 101412

Cited by 41 publications

References 19 publications

HARPS spectropolarimetry of three sharp-lined Herbig Ae stars: New insights

HARPS spectropolarimetry of three sharp-lined Herbig Ae stars: New insights

HD 135344B: a young star has reached its rotational limit

Spectroscopic signatures of magnetospheric accretion in Herbig Ae/Be stars

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