Stellar spectroscopy in ground-based ultraviolet. I: Observational technique

Панчук, В. Е.; Клочкова, В. Г.; Yushkin, M. V.; Yakopov, Mikhail

doi:10.1134/s1990341309040099

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…12 were taken using theéchelle spectrographs of the 6-meter telescope of the Special Astrophysical Observatory. On June 12, 2001, we used the PFES spectrograph (Panchuk et al 1997) with a 1040×1170-pixel CCD at the prime focus and got a spectrum with a resolution of R = λ/∆λ ∼ 15000 (20 km s −1 ). Later we used the NES spectrograph (Panchuk et al 2009) The spectral types we derived for three dates were the same within the errors: B5.0±0.5, B4.8±0.5 and B4.0±0.5.…”

Section: Observations and Resultsmentioning

confidence: 99%

The inhomogeneous wind of the LBV candidate Cyg OB2 No.12

Клочкова¹,

Ченцов²,

Мирошниченко

2010

Proc. IAU

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Abstract. We present the results of high-resolution spectroscopy of the extremely luminous star Cyg OB2 No. 12. We identified about 200 spectral features in the range 4552-7939Å, including the interstellar Na I, K I lines and numerous very strong DIBs, along with the He I, C II, and Si II lines. An MK spectral type we derived for the object is B4.5±0.5 Ia + . Our analysis of the radial velocity data shows the presence of a gradient in the stellar atmosphere, caused by both atmospheric expansion and matter infall onto the star. The Hα emission displays broad Thompson wings, a slightly blue-shifted P Cyg type absorption component and a time-variable core absorption. We conclude that the wind is variable in time.

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Section: Observations and Resultsmentioning

confidence: 99%

The inhomogeneous wind of the LBV candidate Cyg OB2 No.12

Клочкова¹,

Ченцов²,

Мирошниченко

2010

Proc. IAU

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“…The quantum efficiency of the CCD we use is up to 70% in the UV. In general the optical design of the spectrograph allows observing with minimal losses even in the UV down to ≈3100 Å (Panchuk et al 2009b). The automatic guidance system is adjusted using the violet region of the image.…”

Section: Observational Materials and Data Reductionmentioning

confidence: 98%

An atlas of ground UV spectra of selected stars

Клочкова

Ченцов

Kipper

et al. 2011

Astrophys Space Sci

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We present a spectral atlas of 4 B and A stars containing spectra in a poorly studied spectral range of 305-452 nm. The atlas is based on high resolution (R = 60 000) spectra obtained with the 6 meter telescope (SAO, Russia) combined with the NES-spectrograph. The procedure of spectral lines identification and compilation of the atlas is discussed in detail. Using the spectral data we thoroughly investigated the velocity field in expanding atmospheres and envelopes of hot evolved stars β Ori, α Cyg and supergiant KS Per with the extreme hydrogen deficiency. The complete atlas and list of the identified spectral lines will be available via the astronomical database SIMBAD.

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“…High‐resolution spectroscopic observations were carried out from the 6.0‐m Big Telescope Alt‐Azimuthal (BTA) telescope at the Special Astrophysical Observatory (SAO), Nizhny Arkhyz, Russia. The first spectroscopic data were obtained on 2008 November 17 (JD 245 4788.104) with a high‐resolution Nasmyth echelle spectrometer (Panchuk et al ) installed on a Nasmyth platform. A single Th–Ar reference spectrum was obtained immediately after the target star spectra were acquired for wavelength calibration purposes.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

A spectroscopic analysis of the chemically peculiar star HD 207561

Joshi

Semenko

Martinez

et al. 2012

Monthly Notices of the Royal Astronomical Society

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In this paper we present a high‐resolution spectroscopic analysis of the chemically peculiar star HD 207561. During a survey programme to search for new rapidly oscillating Ap (roAp) stars in the Northern hemisphere, Joshi et al. observed significant photometric variability on two consecutive nights in the year 2000. The amplitude spectra of the light curves obtained on these two nights showed oscillations with a frequency of 2.79 mHz (P ∼ 6 min). However, subsequent follow‐up observations could not confirm any rapid variability. In order to determine the spectroscopic nature of HD 207561, high‐resolution spectroscopic and spectropolarimetric observations were carried out. A reasonable fit of the calculated Hβ line profile to the observed one yields an effective temperature (Teff) and surface gravity (log g) of 7300 K and 3.7 dex, respectively. The derived projected rotational velocity (v sin i) for HD 207561 is 74 km s−1, indicative of a relatively fast rotator. The position of HD 207561 in the Hertzsprung–Russell diagram implies that this is slightly evolved from the main‐sequence and located well within the δ‐Scuti instability strip. The abundance analysis indicates the star has slight underabundances of Ca and Sc and mild overabundances of iron‐peak elements. The spectropolarimetric study of HD 207561 shows that the effective magnetic field is within the observational error of 100 G. The spectroscopic analysis revealed that the star has most of the characteristics similar to an Am star, rather than an Ap star, and that it lies in the δ‐Scuti instability strip; hence roAp pulsations are not expected in HD 207561, but low‐overtone modes might be excited.

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Stellar spectroscopy in ground-based ultraviolet. I: Observational technique

Cited by 12 publications

References 14 publications

The inhomogeneous wind of the LBV candidate Cyg OB2 No.12

The inhomogeneous wind of the LBV candidate Cyg OB2 No.12

An atlas of ground UV spectra of selected stars

A spectroscopic analysis of the chemically peculiar star HD 207561

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