J/AcA/72/31 RR Dra RV curves and mid eclipse times (Senavci+, 2022)
RR Draconis:
An Algol-type eclipsing binary with a possible massive tertiary companion.
Senavci H.V., Ceki A., Esmer E.M., Yalcinkaya S., Latkovic O., Bahar E.,
Yilmaz M., Basturk O., Ozavci I., Yorukoglu O., Selam S.O.
<Acta Astron. 72, 31 (2022)>
=2022AcA....72...31S 2022AcA....72...31S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Radial velocities ; Photometry ;
Optical
Keywords: stars: individual: RR Dra - methods: observational -
binaries: eclipsing - techniques: radial velocity
Abstract:
In this study, we present spectroscopic observations of the eclipsing
binary RR Dra carried out with our recently installed T80 telescope in
Ankara University Kreiken Observatory and analyze the first radial
velocity time series of this system. We simultaneously model TESS
light curves along with our radial velocity data to derive absolute
parameters of RR Dra system. Additionally, we investigate the period
variation of the system using all the available eclipse timings in the
literature. In this context, we discuss two possible explanations for
the cyclic nature of the eclipse timings: i) light-time effect that
corresponds to a high-mass but unseen additional component, ii)
magnetic activity of the cooler component. The secular period increase
in eclipse timings of RR Dra may be a combination of mass transfer and
angular momentum loss, amplified by the presence of circumstellar
material.
Description:
Radial velocity values with their errors of the primary and secondary
stars of RR Dra system measured from spectroscopic observations in
AUKR, T80 telescope. Mid eclipse times in HJD with errors, observed
passband and eclipse types.
Objects:
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RA (2000) DE Designation(s)
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18 41 47.40 +62 40 34.94 RR Dra = TYC 4219-906-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rv.dat 42 56 RR Dra radial velocity values
eclipse.dat 35 213 RR Dra mid eclipse times
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Mid-exposure time in Heliocentric Julian Days
15- 21 F7.3 km/s RV1 Radial velocity of the primary component
23- 27 F5.3 km/s e_RV1 Error of the radial velocity measurement
for the primary component
29- 36 F8.3 km/s RV2 Radial velocity of the secondary component
38- 42 F5.3 km/s e_RV2 Error of the radial velocity measurement
for the secondary component
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Byte-by-byte Description of file: eclipse.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Mid-eclipse time in Heliocentric Julian Days
17 I1 --- Type [1/2] Type of the eclipse
(1 - primary, 2 - secondary)
20- 25 A6 --- Filter Passband of Observations
28- 35 F8.6 d e_HJD Mid-eclipse time errors
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Acknowledgements:
Selcuk Yalcinkaya, yalcinkayas(at)ankara.edu.tr
Hakan Volkan Senavci, hsenavci(at)ankara.edu.tr
(End) Patricia Vannier [CDS] 29-Jun-2022