ISSN 1990-3413, Astrophysical Bulletin, 2018, Vol. 73, No. 2, pp. 178–200.
Pleiades Publishing, Ltd., 2018.
Original Russian Text
I.I. Romanyuk, E.A. Semenko, A.V. Moiseeva, D.O. Kudryavtsev, I.A. Yakunin, 2018, published in Astroﬁzicheskii Byulleten’, 2018, Vol. 73, No. 2,
Results of Magnetic-Field Measurements with the 6-m Telescope. V.
Observations in 2011
I. I. Romanyuk
, E. A. Semenko, A. V. Moiseeva, D. O. Kudryavtsev, and I. A. Yakunin
Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 369167 Russia
Received March 01, 2018; in ﬁnal form, March 17, 2018
Abstract—The paper presents results of measurements of magnetic-ﬁeld longitudinal components B
radial velocities V
, and projections of the rotation velocity in the line of sight v
sin i for 74 objects, mainly
main-sequence chemically peculiar stars and standard stars. Observations were carried out in 2011 at
the 6-m BTA telescope using the Main Stellar Spectrograph (MSS) with a Zeeman analyzer. Seven new
magnetic stars were discovered: HD 38129, HD 47152, HD 50341, HD 63347, HD 188501, HD 191287,
and HD 260858. Three more stars were suspected to have magnetic ﬁelds. Observations of magnetic
standard stars and non-magnetic stars conﬁrm the absence of any systematic errors capable of introducing
distortions into the B
longitudinal-ﬁeld measurement results. The paper gives comments on the research
results for each of the 74 stars.
Key words: stars: magnetic ﬁeld—stars: chemically peculiar
We continue the series of publications on stellar
magnetic ﬁeld measurements for chemically peculiar
stars performed at the 6-m SAO RAS telescope.
Goals of the studies, methods, and observation re-
sults for 2007–2010 are given in the papers by Ro-
manyuk et al. [1–4]. During the last four years, we
discovered 28 new magnetic CP stars.
The present paper gives the results of measuring
longitudinal magnetic ﬁelds B
, radial velocities V
and projections of the rotation velocity in the line of
sin i for the stars observed in 2011.
Scientiﬁc substantiation of studies of our series
is given in previous publications [1–4]. Instruments,
methods of observations and data reduction in general
have not been considerably changed in comparison
with previous years. In the comments, greater atten-
tion is paid to the stars, magnetic studies of which
were performed for the ﬁrst time.
2. OBSERVATIONS AND REDUCTION
The data used as a basis for this study were ob-
tained during 15 nights of observations within the
scope of four main programs:
1. “Magnetic ﬁelds of massive stars” (principal
applicant—I. I. Romanyuk, SAO RAS);
2. “New magnetic stars” (principal applicant—
D. O. Kudryavtsev, SAO RAS);
3. “Selected magnetic stars” (principal applicant—
E. A. Semenko, SAO RAS);
4. “Magnetic ﬁeld geometry of CP stars” (principal
applicant—G. Wade, Canada).
Observations, as before, were carried out at the
6-m BTA telescope using the Main Stellar Spec-
 equipped with a circular polarization
analyzer . The CCD sized 4600×2000 elements
was used as a light detector. Mainly, we worked in
the spectral range of 4450–5000
A with the spectral
resolution R = 15 000. The details are described in
We obtained 148 pairs of circularly polarized spec-
tra for 74 stars. The list of objects signiﬁcantly diﬀers
from the previous ones.
Primary data analysis including the image re-
duction, extraction and calibration of spectra was
performed with the method accepted in SAO RAS
(developed by D. O. Kudryavtsev . Technical details
have been earlier repeatedly described in papers [1–4].
Magnetic-ﬁeld measurements were carried out with
two methods: the modiﬁed Babcock method ,
which we used for many decades and also with the
software allowing one to determine a longitudinal