J/ApJ/936/129 Toward Understanding the B[e] Phenomenon. IX (Nodyarov+, 2022)
Toward Understanding the B[e] Phenomenon.
IX. Nature and Binarity of MWC645.
Nodyarov A.S., Miroshnichenko A.S., Khokhlov S.A., Zharikov S.V.,
Manset N., Klochkova V.G., Grankin K.N., Arkharov A.A., Efimova N.,
Klimanov S., Larionov V.M., Rudy R.J., Puetter R.C., Perry R.B.,
Reva I.V., Omarov C.T., Kokumbaeva R.I.
<Astrophys. J., 936, 129 (2022)>
=2022ApJ...936..129N 2022ApJ...936..129N
ADC_Keywords: Binaries, spectroscopic ; Stars, Be; Photometry, infrared;
Optical
Keywords: A stars ; Binary stars ; Spectroscopic binary stars ; Be
stars ; Emission line stars
Abstract:
We present the results of optical and near-IR spectroscopy and
multicolor photometry of the emission-line star MWC 645, which
exhibits the B[e] phenomenon. The presence of positionally variable
absorption lines of a cool star detected for the first time indicates
that the object is a binary system. Using a combination of the
photometric and spectroscopic data as well as the Gaia EDR3 distance
(D=6.5±0.9kpc), we disentangled the components' contributions and
estimated their surface temperatures and luminosities (18000±2000K
and 4250±250K, log(L/L☉)=4.0±0.5 and 3.1±0.3 for the
hot and cool components, respectively). Quasi-cyclic short-period
(months) and long-period (∼4yr) photometric variations were detected
in both optical and near-IR regions, and are most likely due to
variable circumstellar extinction. Our analysis suggests that MWC 645
is a member of the FS CMa group. The object's properties can be
described by an evolutionary model of a close binary system that
currently undergoes a nonconservative mass transfer between
intermediate-mass stars (e.g., 7M☉+2.8M☉).
Description:
We obtained optical high-resolution spectroscopic observations of
MWC645 with the 2.7m Harlan J. Smith telescope of the McDonald
Observatory (Texas, USA, R=60000) with the Tull coude spectrograph TS2
(Tull et al. 1995), the 2.1 m telescope of the Observatorio
Astronomico Nacional San Pedro Martir (OAN SPM, Baja California,
Mexico, R=18000) with an REOSC spectrograph, the 6m telescope of
Special Astrophysical Observatory(SAO, Nizhnij Arkhyz, Russia,
R=60000) with the NES spectrograph, and the 3.6m Canada-France-Hawaii
Telescope (CFHT, Maunakea, HI, USA, R=65000) with the ESPaDOnS
spectropolarimeter.
Objects:
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RA (2000) DE Designation(s)
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21 53 27.48 +52 59 58.0 MWC 645 = 2MASS J21532748+5259579
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 34 58 *Optical photometry of MWC 645
table3.dat 43 64 Near-IR photometry of MWC 645
table4.dat 32 226 List of emission lines identified in the 2008
CFHT spectrum of MWC 645
table6.dat 38 122 List of absorption lines identified in the spectrum
of MWC 645
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Note on table2.dat: Average uncertainties of individual measurements
are ∼0.01-0.02 mag.
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See also:
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
VI/71 : Revised version of the ILLSS Catalogue (Coluzzi 1993-1999)
J/A+AS/120/99 : Spectroscpy of MWC 645 (Jaschek+, 1996)
J/A+A/463/233 : UBV and radial velocity light curves of beta Lyr (Ak+, 2007)
J/A+A/487/1129 : Evolutionary models of binaries (Van Rensbergen+, 2008)
J/A+A/537/A146 : Star models with rotation. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)
J/ApJ/746/154 : Improved kinematic plxes for Sco-Cen members (Pecaut+, 2012)
J/ApJ/774/72 : Measure of 19 DIBs and 8 other interstellar lines (Kos+, 2013)
J/ApJ/809/129 : The Be phenomenon. V. MWC728 (Miroshnichenko+, 2015)
J/ApJ/856/158 : The B[e] phenomenon. VII. AS 386 follow-up (Khokhlov+, 2018)
J/ApJ/897/48 : Props of Galactic Be Supergiants. VI. (Miroshnichenko+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d HJD [53228/59736] Heliocentric Julian Date; HJD-2400000
12 A1 --- Flag [ab] Location flag (1)
14- 18 F5.2 mag Vmag [12.8/13.3] Apparent V band magnitude
20- 24 F5.2 mag UB [-0.37/0.13]? The (U-B) color-index
26- 29 F4.2 mag BV [0.7/1.06] The (B-V) color-index
31- 34 F4.2 mag VR [2.01/2.28]? The (V-R) color-index
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Note (1): Flags as follows:
a = photometry from CrAO;
b = photometry from TShAO.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d HJD [54757/57897] Average Heliocentric Julian Date;
HJD-2400000
12- 12 A1 --- Flag [a] Location flag (1)
14- 18 F5.2 mag Jmag [9.19/10.15]? Apparent J band magnitude
20- 23 F4.2 mag e_Jmag [0.01/0.04]? Uncertainty in Jmag
25- 28 F4.2 mag Hmag [7.88/8.74]? Apparent H band magnitude
30- 33 F4.2 mag e_Hmag [0.01/0.05]? Uncertainty in Hmag
35- 38 F4.2 mag Kmag [6.42/7.11] Apparent K band magnitude
40- 43 F4.2 mag e_Kmag [0.01/0.06] Uncertainty in Kmag
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Note (1): Flag as follows:
a = photometry was taken at OAN SPM.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Line Element and ionization state
12- 14 A3 --- Mult Multiplet number (1)
16- 23 F8.2 0.1nm Wave [3966/10407] Line laboratory wavelength; Angstroms
25- 30 F6.1 km/s RVel [-124.5/-15.7] Radial velocity
32- 32 A1 --- Flag [:] Indicates identification is uncertain
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Note (1): A dash indicates the multiplet is undefined.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Line Element and ionization state
5- 8 I4 --- Mult [1/1277] Multiplet number (1)
10- 16 F7.2 0.1nm Wave [4611/9000] Line laboratory wavelength; Angstroms
18- 22 F5.1 km/s RVel1 [-38.3/-12.4] The 2008 CFHT spectrum radial velocity
24- 27 F4.2 0.1nm EW1 [0.02/0.33]? The 2008 CFHT spectrum equivalent
width; Angstoms
29- 33 F5.1 km/s RVel2 [-66.8/-38.5]? The 2021 CFHT spectrum radial
velocity
35- 38 F4.2 0.1nm EW2 [0.02/0.14]? The 2021 CFHT spectrum equivalent
width; Angstoms
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Note (1): A dash indicates the multiplet is undefined.
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History:
From electronic version of the journal
References:
Khokhlov et al. Paper VI : 2017ApJ...835...53K 2017ApJ...835...53K
(End) Prepared by [AAS], Coralie Fix [CDS], 27-Jun-2024