J/A+A/666/A136 V1294 Aql radial velocities and photometry (Harmanec+, 2022)
V1294 Aql = HD 184279: A bad boy among Be stars or an important clue to the
Be phenomenon?
Harmanec P., Bovzic H., Koubsky P., Yang S., Ruzdjak D., Sudar D.,
Slechta M., Wolf M., Korcakova D., Zasche P., Oplistilova A., Vrsnjak D.,
Ak H., Eenens P., Bakis H., Bakis V., Otero S., Chini R., Demsky T.,
Barlow B.N., Svoboda P., Jonak J., Vitovsky K., Harmanec A.
<Astron. Astrophys. 666, A136 (2022)>
=2022A&A...666A.136H 2022A&A...666A.136H (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Stars, Be ; Radial velocities ;
Photometry, UBVRI
Keywords: binaries: spectroscopic - stars: emission-line, Be -
stars: fundamental parameters
Abstract:
A reliable determination of the basic physical properties and
variability patterns of hot emission-line stars is important for
understanding the Be phenomenon and ultimately, the evolutionary stage
of Be stars. This study is devoted to one of the most remarkable Be
stars, V1294 Aql = HD 184279. We collected and analysed spectroscopic
and photometric observations covering a time interval of about 25000d
(68yr). We present evidence that the object is a single-line 192.9d
spectroscopic binary and estimate that the secondary probably is a hot
compact object with a mass of about 1.1-1.2M☉. We found and
documented very complicated orbital and long-term spectral, light, and
colour variations, which must arise from a combination of several
distinct variability patterns. Attempts at modelling them are planned
for a follow-up study. We place the time behaviour of V1294 Aql into
context with variations known for some other systematically studied Be
stars and discuss the current ideas about the nature of the Be
phenomenon.
Description:
Inidividual photometric observations of V1294 Aql from different
observing stations. Individual observing stations are identified by
numerical codes defined in Table 2 of the paper. Values either 99.999
or 999.999 stand for missing observations.
Objects:
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RA (2000) DE Designation(s)
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19 33 36.92 +03 45 40.8 V1294 Aql = HD 184279
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 83 179 V1294 Aql all measured radial velocities
table4.dat 87 874 V1294 Aql spectrophotometry of selected
spectral lines
table5a.dat 79 956 V1294 AQL (HD 184279) UBV all-sky photometry
from various sources
table5b.dat 68 1392 V1294 Aql (HD 184279) differential UBV
photometry from various stations
table5c.dat 77 593 V1294 Aql (HD 184279) Hvar UBVR
differential photometry
table5d.dat 42 1637 V1294 Aql (HD 184279) BVR differential
photometry of P. Svoboda, Brno
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (HJD-2400000.0)
11- 17 F7.2 km/s RVH3em ?=999.99 RV of Hα emission wings
18- 24 F7.2 km/s RVHeem ?=999.99 RV of HeI 6678Å emission wings
25- 31 F7.2 km/s RVSiem ?=999.99 RV of SiII 6347 & 6371Å
emission wings
32- 38 F7.2 km/s RVH3abs ?=999.99 RV of the absorption core of Hα
39- 45 F7.2 km/s RVHeabs ?=999.99 RV of the absorption core of
HeI 6678Å
46- 52 F7.2 km/s RVSiabs ?=999.99 RV of the absorption cores of
SiII lines
53- 59 F7.2 km/s RVHewin ?=999.99 RV of outer absorption wings of
HeI 6678Å
60- 66 F7.2 km/s RVFeabs ?=999.99 RV of the FeII 6456Å absorption
67- 83 A17 --- Obs/Inst Observatory/instrument
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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- 8 A8 --- Line Line (Halpha, HeI6678, FeII6456, SiII6347,
SiII6371)
10- 19 F10.4 d RJD Heliocentric Julian date (HJD-2400000.0)
20- 26 F7.2 0.1nm EW ?=999.99 Equivalent width
27- 34 F8.3 --- V ?=999.999 Relative intensity of the V emission
peak IV
35- 42 F8.3 --- R ?=999.999 Relative intensity of the R emission
peak IR
43- 50 F8.3 --- Ic ?=999.99 Central intensity in continuum units
51- 58 F8.3 --- V/R ?=999.999 Ratio of emission-peak intensities
IV/IR
59- 66 F8.3 --- (V+R)/2 ?=999.999 Mean emission peak intensity
(IV+IR)/2
68- 87 A20 --- Source Source of data (literature of spectrograph)
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Byte-by-byte Description of file: table5a.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (HJD-2400000.0)
11- 17 F7.3 mag Vmag Johnson V magnitude
18- 24 F7.3 mag Bmag ?=99.999 Johnson B magnitude
25- 31 F7.3 mag Umag ?=99.999 Johnson U magnitude
32- 38 F7.3 mag B-V ?=99.999 Johnson B-V colour index
39- 45 F7.3 mag U-B ?=99.999 Johnson U-B colour index
46- 79 A34 --- Ref Literature reference for the data source
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Byte-by-byte Description of file: table5b.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (HJD-2400000.0)
11- 17 F7.3 mag Vmag Johnson V magnitude
18- 24 F7.3 mag Bmag ?=99.999 Johnson B magnitude
25- 31 F7.3 mag Umag ?=99.999 Johnson U magnitude
32- 38 F7.3 mag B-V ?=99.999 Johnson B-V colour index
39- 45 F7.3 mag U-B ?=99.999 Johnson U-B colour index
46- 52 I7 --- HDcomp HD number of the comparison star used
53- 58 F6.3 --- X ? Air mass
59- 65 F7.3 --- dX ? Difference in air mass in the sense
variable-comparison
66- 68 I3 --- Station Observatory code (G1)
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Byte-by-byte Description of file: table5c.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (HJD-2400000.0)
11- 16 F6.3 mag Vmag Johnson V magnitude
17- 22 F6.3 mag Bmag Johnson B magnitude
23- 28 F6.3 mag Umag Johnson U magnitude
29- 34 F6.3 mag Rmag Johnson R magnitude
35- 41 F7.3 mag B-V Johnson B-V colour index
42- 48 F7.3 mag U-B Johnson U-B colour index
49- 54 F6.3 mag V-R Johnson V-R colour index
55- 60 F6.3 --- X Air mass of the variable
61- 67 F7.3 --- dX Air-mass difference variable minus comparison
68- 74 I7 --- HDcomp HD number of the comparison star used
75- 77 I3 --- Station Observatory code (G1)
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Byte-by-byte Description of file: table5d.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (HJD-2400000.0)
11- 17 F7.3 mag Vmag ?=99.999 Johnson V magnitude
18- 24 F7.3 mag Bmag ?=99.999 Johnson B magnitude
25- 31 F7.3 mag Rmag ?=99.999 Cousins R magnitude
32- 38 I7 --- HDcomp HD number of the comparison star
39- 42 I4 --- Station Observatory code (G1)
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Global notes:
Note (G1): Observatory codes as follows:
1 = Hvar 0.65m reflector, EMI tubes
2 = Brno private observatory of P. Svoboda, Sonnar 0.034m refractor
with a CCD camera
4 = Ondrejov 0.65m reflector, EMI tube
12 = La Silla 0.50m Danish reflector: Part 1 are all-sky observations, the
rest are differential observations secured during a long-term campaign.
The original uvby observations were transformed to UBV
20 = Toronto 0.40m reflector, EMI 6094 tube
26 = Haute Provence 0.60m reflector, Lallemand tube
30 = San Pedro Martir 0.84m and 1.50m reflectors (13C photometry), more recent
UBV observations were secured with the 0.84m reflector and
Cuenta-pulsos photometer
34 = Lick 0.61m Boller & Chivens telescope, refrigerated S20 tube
37 = Jungfraujoch Sphinx mountain station 0.40m reflector, Geneva photometer
44 = MtPalomar 0.51m reflector, EMI 6094 tube
59 = Cape Town 1.0m reflector, UBV photometer
61 = Hipparcos Hp photometry transformed into Johnson V
66 = Tuebitak National Observatory 0.40m reflector with SSP-5A photometer
89 = Canakkale Mountain Station 0.40m reflector, SSP-5 photometer
90 = Teramo 0.40m refractor
91 = US Naval Observatory Ritchey-Chretien 1.0m reflector, EMI 9524B tube
92 = Stefanion ESO Netherlands Van Straaten 0.40m reflector, EMI 6256B tube
93 = ASAS3 automatic all-sky photometric survey.
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Acknowledgements:
Petr Harmanec, Petr.Harmanec(at)mff.cuni.cz,
Astronomical institute, Charles University, Czech Republic
(End) P. Harmanec [Charles Univ. Czech Republic], P. Vannier [CDS] 06-Sep-2022