J/A+A/590/A54 alpha Vir RV and EW variations (Harrington+, 2016)
Alpha Virginis: line-profile variations and orbital elements.
Harrington D., Koenigsberger G., Olguin E., Berdyugina S.V., Lara B.,
Moreno E.
<Astron. Astrophys. 590, A54 (2016)>
=2016A&A...590A..54H 2016A&A...590A..54H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Radial velocities ; Equivalent widths
Keywords: binaries: close - stars: fundamental parameters -
stars: oscillations - stars: individual: α Vir -
stars: evolution
Abstract:
Alpha Virginis (Spica) is a B-type binary system whose proximity and
brightness allow detailed investigations of the internal structure and
evolution of stars undergoing time-variable tidal interactions.
Previous studies have led to the conclusion that the internal
structure of Spica's primary star may be more centrally condensed
than predicted by theoretical models of single stars, raising the
possibility that the interactions could lead to effects that are
currently neglected in structure and evolution calculations. The key
parameters in confirming this result are the values of the orbital
eccentricity e, the apsidal period U, and the primary star's radius,
R1.
The aim of this paper is to analyze the impact that Spica's line
profile variability has on the derivation of its orbital elements and
to explore the use of the variability for constraining R1.
Description:
We use high signal-to-noise and high spectral resolution observations
obtained in 2000, 2008, and 2013 to derive the orbital elements from
fits to the radial velocity curves. We produce synthetic line profiles
using an ab initio tidal interaction model.
Objects:
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RA (2000) DE Designation(s)
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13 25 11.58 -11 09 40.8 alpha Vir = HR 5056
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
notdata.dat 37 585 alpha Vir SOFIN measurements
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Byte-by-byte Description of file: notdata.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID Identification number
6 A1 --- n_ID [*]
8- 12 F5.3 d JD Julian date (JD-2451650)
14- 19 F6.4 --- Phase Orbital phase (phi=4.014597)
21- 24 I4 km/s RV1 Radial velocity for the primary M1
26- 28 I3 0.1pm EW1 Equivalent width for the primary
30- 33 I4 km/s RV2 ?=-Radial velocity for the secondary M2
35- 37 I3 0.1pm EW2 ?=- Equivalent width for the secondary
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Acknowledgements:
Dave Harrington, dharring96(at)gmail.com
(End) Patricia Vannier [CDS] 28-Mar-2016