The magnetic field of the pre-main sequence Herbig Ae star
HD 190073

Catala, C.; Alécian, E.; Donati, J. F.; Wade, G. A.; Landstreet, J. D.; Böhm, T.; Bouret, Jean-Claude; Bagnulo, S.; Folsom, C. P.; Silvester, J.

doi:10.1051/0004-6361:20066264

Cited by 77 publications

(104 citation statements)

References 28 publications

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“…Our old measurements (Hubrig et al 2006a) revealed a magnetic field of the order of 80 G at the 2.8σ level, in full agreement with the high resolution ESPaDOnS spectropolarimetric data, whereas Wade et al (2007) failed to detect the magnetic field in both previous measurements carried out with FORS 1 in November 2004. Our new measurements B z = 104 ± 19 G using the full spectrum and B z = 120 ± 32 G using hydrogen lines confirm the results presented by Catala et al (2007). Baines et al (2006) reported the presence of a potential companion.…”

Section: Herbig Ae/be Stars With Detected Magnetic Fieldssupporting

confidence: 90%

“…HD 190073: a magnetic field of B z = 74±10 G was detected using photospheric metal lines with ESPaDOnS (Catala et al 2007). Our old measurements (Hubrig et al 2006a) revealed a magnetic field of the order of 80 G at the 2.8σ level, in full agreement with the high resolution ESPaDOnS spectropolarimetric data, whereas Wade et al (2007) failed to detect the magnetic field in both previous measurements carried out with FORS 1 in November 2004.…”

Section: Herbig Ae/be Stars With Detected Magnetic Fieldsmentioning

confidence: 99%

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Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks

Hubrig

Stelzer

Schöller

et al. 2009

A&A

100

149

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Context. Recently, evidence for the presence of weak magnetic fields in Herbig Ae/Be stars has been found in several studies. Aims. We seek to expand the sample of intermediate-mass pre-main sequence stars with circular polarization data to measure their magnetic fields, and to determine whether magnetic field properties in these stars are correlated with mass-accretion rate, disk inclination, companions, silicates, PAHs, or show a correlation with age and X-ray emission as expected for the decay of a remnant dynamo. Methods. Spectropolarimetric observations of 21 Herbig Ae/Be stars and six debris disk stars have been obtained at the European Southern Observatory with FORS 1 mounted on the 8 m Kueyen telescope of the VLT. With the GRISM 600B in the wavelength range 3250-6215 Å we were able to cover all hydrogen Balmer lines from Hβ to the Balmer jump. In all observations a slit width of 0. 4 was used to obtain a spectral resolving power of R ≈ 2000. Results. Among the 21 Herbig Ae/Be stars studied, new detections of a magnetic field were achieved in six stars. For three Herbig Ae/Be stars, we confirm previous magnetic field detections. The largest longitudinal magnetic field, B z = −454 ± 42 G, was detected in the Herbig Ae/Be star HD 101412 using hydrogen lines. No field detection at a significance level of 3σ was achieved in stars with debris disks. Our study does not indicate any correlation of the strength of the longitudinal magnetic field with disk orientation, disk geometry, or the presence of a companion. We also do not see any simple dependence on the mass-accretion rate. However, it is likely that the range of observed field values qualitatively supports the expectations from magnetospheric accretion models giving support for dipole-like field geometries. Both the magnetic field strength and the X-ray emission show hints of a decline with age in the range of ∼2-14 Myr probed by our sample, supporting a dynamo mechanism that decays with age. However, our study of rotation does not show any obvious trend of the strength of the longitudinal magnetic field with rotation period. Furthermore, the stars seem to obey the universal power-law relation between magnetic flux and X-ray luminosity established for the Sun and main-sequence active dwarf stars.

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Section: Herbig Ae/be Stars With Detected Magnetic Fieldssupporting

confidence: 90%

Section: Herbig Ae/be Stars With Detected Magnetic Fieldsmentioning

confidence: 99%

Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks

Hubrig

Stelzer

Schöller

et al. 2009

A&A

100

149

View full text Add to dashboard Cite

show abstract

“…Later on, this star was studied by Catala et al (2007) with ESPaDOnS observations, who confirmed the presence of a magnetic field, B z = 74 ± 10 G, at a higher significance level. A longitudinal magnetic field B z = 104 ± 19 G was reported by Hubrig et al (2009) using FORS 1 measurements.…”

Section: Hd 190073mentioning

confidence: 93%

“…The absorption and emission spectrum of the Herbig Ae star HD 190073 was studied in detail by Catala et al (2007) and more recently by Cowley & Hubrig (2012). The low projected rotational velocity (v sin i ≤ 9 km s −1 ) may indicate either a very slow rotation, or a very small inclination of the rotation axis with respect to the line of sight.…”

Section: Hd 190073mentioning

confidence: 99%

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 intriguing spectrum of the magnetic Herbig Ae star HD 190073 (V1295 Aql) has attracted the attention of classical as well as modern spectroscopists (Merrill 1933;Swings & Struve 1940;Catala et al 2007, henceforth CAT). Pogodin, Franco & Lopes (2005, henceforth P05) give a detailed description of the spectrum along with a historical resume of investigations from the 1930's.…”

Section: Introductionmentioning

confidence: 99%

The absorption and emission spectrum of the magnetic Herbig Ae star HD 190073

Cowley¹,

Hubrig²

2012

Astron Nachr

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We determine abundances from the absorption spectrum of the magnetic Herbig Ae star HD 190073 (V1295 Aql). The observations are primarily from HARPS spectra obtained at a single epoch. We accept arguments that the presence of numerous emission lines does not vitiate a classical abundance analysis, though it likely reduces the achievable accuracy. Most abundances are closely solar, but several elements show departures of a factor of two to three, as an earlier study has also shown. We present quantitative measurements of more than 60 emission lines, peak intensities, equivalent widths, and FWHM's. The latter range from over 200 km s −1 (Hα, He D3) down to 10-20 km s −1 (forbidden lines

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The magnetic field of the pre-main sequence Herbig Ae star HD 190073

Cited by 77 publications

References 28 publications

Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks

Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks

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

The absorption and emission spectrum of the magnetic Herbig Ae star HD 190073

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