J/A+A/567/A57 HD 161306 Hα and HeI spectra (Koubsky+, 2014)
HD 161306: a radiatively interacting Be binary.
Koubsky P., Kotkova L., Kraus M., Yang S., Slechta M., Harmanec P., Wolf M.,
Voruba V., Kubat J., Kubatova B., Niemczura E., Skoda P.
<Astron. Astrophys. 567, A57 (2014)>
=2014A&A...567A..57K 2014A&A...567A..57K
ADC_Keywords: Stars, Be ; Binaries, spectroscopic ; Radial velocities ;
Spectroscopy
Keywords: stars: close - stars: binaries: spectroscopic -
stars: emission-line, Be - stars: individual: HD 161306
Abstract:
The spectrum of the Be star HD 161306 is shown to vary periodically
with a period of ∼100-days. The radial velocity of the HeI 6678Å
emission peak varying in antiphase to the radial velocity of the
Hα emission wings component suggests that the star is a binary
similar to φ Per, 59 Cyg, or FY CMa, i.e. a radiatively
interacting Be binary - a rare case among Be stars. This type of
object is also called a φ Per-type binary or Be + sdO binaries.
The range of radial-velocity variations of the strong emission peak in
the helium line observed in HD 161306 is about 180km/s, similar to
what is observed for these systems. We therefore conclude that HD
161306 may represent another case of a Be star with a hot subdwarf
companion.
Description:
35 spectra taken in Ondrejov listed in Table 1 of the paper and
identified with Date (HJD-2400000) in column 1. HJD (middle of the
exposure) is included in the FITS header of particular spectrum. Two
segments are given: Hα segment covers 6548-6575Å region -
first letter of the file name is a, while HeI covers 6670-6685Å
region - first letter of the file name is e. The spectra were
corrected for bias and for detector non-linearity using flat-fields
frame. They were then calibrated in wavelength and the heliocentric
correction was applied.
Objects:
-----------------------------------------------------
RA (2000) DE Designation(s)
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17 45 07.70 -09 48 54.4 HD 161306 = HIP 86884
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 117 43 Radial velocity measurements and list of FITS spectra
sp/* . 70 Individual FITS spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d Date Heliocentric Julian date (HJD-2400000)
13- 17 F5.3 --- Phase Phase
19- 23 F5.1 km/s V(Ha) Hα radial velocity
25- 27 F3.1 km/s e_V(Ha) rms uncertainty on V(Ha)
29- 33 F5.1 km/s V(HeI) ? HeI radial velocity (1)
35- 37 F3.1 km/s e_V(HeI) ? rms uncertainty on V(HeI)
39- 42 A4 --- Src Origin of spectra (2)
44- 59 F16.8 d HJD ? More precise Heliocentric Julian date
61- 68 F8.6 0.1nm Res(Ha) [0.23/0.26]? Hα wavelength resolution
70- 72 I3 --- N(Ha) [59/118]? Number of pixels for Hα line
74- 75 I2 Kibyte S(Ha) [11/14]? Size of FITS Hα spectrum
77- 88 A12 --- SpHa Name of Hα (6548-6575Å) spectrum file
in subdirectory sp
90- 97 F8.6 0.1nm Res(He) ? HeI wavelength resolution
99-101 I3 --- N(He) [59/118]? Number of pixels for HeI line
103-104 I2 Kibyte S(He) [11/14]? Size of FITS HeI spectrum
106-117 A12 --- SpHe Name of HeI (6670-6685Å) spectrum file
in subdirectory sp
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Note (1): Blank means that emission component is not visible.
Note (2): Origin of spectra:
OND = Ondvrejov. The first two Ondvrejov spectra were recorded with
the SITe chip, the rest with the Pylon chip.
DAO = Dominion Astrophysical Observarory
BeSS = BeSS database
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Acknowledgements:
Pavel Koubsky, koubsky(at)sunstel.asu.cas.cz
(End) Patricia Vannier [CDS] 16-Jun-2014