J/AJ/153/36 New minima timings and RVs for 3 eclipsing binaries (Zasche+, 2017)
V773 Cas, QS Aql, and BR Ind: eclipsing binaries as parts of multiple systems.
Zasche P., Jurysek J., Nemravova J., Uhlar R., Svoboda P., Wolf M.,
Honkova K., Masek M., Prouza M., Cechura J., Korcakova D., Slechta M.
<Astron. J., 153, 36-36 (2017)>
=2017AJ....153...36Z 2017AJ....153...36Z (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Binaries, eclipsing ;
Photometry, UBVRI ; Radial velocities
Keywords: binaries: eclipsing - binaries: spectroscopic -
stars: fundamental parameters -
stars: individual: V773 Cas, QS Aql, BR Ind
Abstract:
Eclipsing binaries remain crucial objects for our understanding of the
universe. In particular, those that are components of multiple systems
can help us solve the problem of the formation of these systems.
Analysis of the radial velocities together with the light curve
produced for the first time precise physical parameters of the
components of the multiple systems V773 Cas, QS Aql, and BR Ind. Their
visual orbits were also analyzed, which resulted in slightly improved
orbital elements. What is typical for all these systems is that their
most dominant source is the third distant component. The system V773 Cas
consists of two similar G1-2V stars revolving in a circular orbit and
a more distant component of the A3V type. Additionally, the improved
value of parallax was calculated to be 17.6 mas. Analysis of QS Aql
resulted in the following: the inner eclipsing pair is composed of B6V
and F1V stars, and the third component is of about the B6 spectral
type. The outer orbit has high eccentricity of about 0.95, and
observations near its upcoming periastron passage between the years
2038 and 2040 are of high importance. Also, the parallax of the system
was derived to be about 2.89 mas, moving the star much closer to the
Sun than originally assumed. The system BR Ind was found to be a
quadruple star consisting of two eclipsing K dwarfs orbiting each
other with a period of 1.786 days; the distant component is a
single-lined spectroscopic binary with an orbital period of about 6 days.
Both pairs are moving around each other on their 148 year orbit.
Description:
Spectroscopy was obtained in two observatories. Most of the data
points for these systems came from the Ondrejov observatory and its 2 m
telescope (resolution R∼12500). Additionally, data on BR Ind and some
data on QS Aql were obtained with the FEROS instrument mounted on the
2.2 m MPG telescope located in La Silla Observatory in Chile (R∼48000).
Photometry for these three systems was collected over the time span of
2008 to 2016. Owing to the relatively high brightness of the targets,
only rather small telescopes were used for these photometric observations.
The system V773 Cas was observed (by one of the authors, PS) with a 34 mm
refractor at a private observatory in Brno, Czech Republic, using an
SBIG ST-7XME CCD camera. The star QS Aql was monitored (by one of the
authors, RU) with a similar instrument at a private observatory in
Jilove u Prahy, Czech Republic, using a G2-0402 CCD camera. The only
southern star, BR Ind, was observed with the FRAM telescope (Prouza et al.
2010AdAst2010E..31P 2010AdAst2010E..31P), installed and operated at the Pierre Auger
Observatory at Malargue, Argentina.
Objects:
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RA (ICRS) DE Designation(s)
--------------------------------------------------
01 44 17.96 +57 32 11.8 V773 Cas = HD 10543
19 41 05.53 +13 48 56.5 QS Aql = HD 185936
21 11 22.79 -52 20 21.3 BR Ind = HD 201427
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 49 65 List of new minima timings used for the analysis
table9.dat 44 100 List of the radial velocities used for
the analysis
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See also:
V/118 : Catalog of eclipsing binaries parameters (Perevozkina+, 1999)
J/A+A/387/850 : Radial velocities of eclipsing binaries (Imbert, 2002)
J/MNRAS/400/969 : ASAS detached eclipsing binaries parameters
(Helminiak+, 2009)
Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID Star identifier (V773 Cas, QS Aql or BR Ind)
11- 21 F11.5 d HJD Heliocentric Julian Date (HJD-2400000)
23- 29 F7.5 d e_HJD Error in HJD
31- 34 A4 --- Type Observation type (Prim=Primary, Sec=Secondary)
36- 39 A4 --- Filter Filter used
41- 49 A9 --- Source Source of the observation (1)
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Note (1): RU and PS are initials of the co-authors names (Uhlar R. and
Svoboda P.).
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Byte-by-byte Description of file: table9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID Star identifier (V773 Cas, QS Aql or BR Ind)
11- 20 F10.4 d HJD Heliocentric Julian Date (HJD-2400000)
22- 29 F8.3 km/s RV1 [-108.033/103.565] Primary radial velocity
31- 38 F8.3 km/s RV2 [-231.485/189.186]? Secondary radial velocity
40- 44 A5 --- Obs Observatory (1)
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Note (1): Observatory as follows:
Ond = A 2 m telescope at the Ondrejov observatory in the Czech Republic;
FEROS = Fiber-fed Extended Range Optical Spectrograph (FEROS) at the Max
Planck Gesellschaft (MPG) 2.2m telescope located in La Silla
Observatory in Chile.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 10-Apr-2018