J/AJ/141/17 5-year spectroscopy and photometry of Deneb (Richardson+, 2011)
A five-year spectroscopic and photometric campaign on the prototypical
α Cygni variable and A-type supergiant star Deneb.
Richardson N.D., Morrison N.D., Kryukova E.E., Adelman S.J.
<Astron. J., 141, 17 (2011)>
=2011AJ....141...17R 2011AJ....141...17R
ADC_Keywords: Stars, variable ; Stars, supergiant ; Equivalent widths ;
Photometry, uvby
Keywords: stars: early-type - stars: individual (Deneb) - stars: mass-loss -
stars: variables: general - supergiants
Abstract:
Deneb is often considered the prototypical A-type supergiant and is
one of the visually most luminous stars in the Galaxy. A-type
supergiants are potential extragalactic distance indicators, but the
variability of these stars needs to be better characterized before
this technique can be considered reliable. We analyzed 339
high-resolution echelle spectra of Deneb obtained over the five-year
span of 1997 through 2001 as well as 370 Stroemgren photometric
measurements obtained during the same time frame. Our spectroscopic
analysis included dynamical spectra of the Hα profile, Hα
equivalent widths, and radial velocities measured from SiII
λλ 6347, 6371.
Description:
Three hundred and thirty-nine high-resolution (R=26000) red-yellow
spectra of Deneb were obtained between 1997 March 20 and 2001 December
21 with the Ritter Observatory 1m telescope and fiber-fed echelle
spectrograph.
Three hundred and seventy differential Stroemgren photometric
measurements were made with the Four College Automated Photoelectric
Telescope (FCAPT) during the concurrent time period of 1997 October 29
to 2001 July 2.
Objects:
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RA (2000) DE Designation(s)
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20 41 25.92 +45 16 49.2 Deneb = alpha Cyg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 281 Spectroscopic measurements of the Hα profile
and Si II doublet
table2.dat 61 368 Stromgren photometry of Deneb
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See also:
J/A+A/364/237 : Elemental abundances of Deneb (Albayrak+, 2000)
J/A+A/400/1043 : Spectroscopic atlas of Deneb 3826-5212Å (Albayrak+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d HJD Heliocentric Julian Date of observation
18- 21 F4.2 0.1nm Ha.n Hα net equivalent width (in Å)
23- 27 F5.2 0.1nm Ha.e Hα emission equivalent width (in Å)
29- 32 F4.2 0.1nm Ha.a Hα absorption equivalent width (in Å)
34- 39 F6.2 km/s V6347 SiII (6347Å) radial velocity
41- 46 F6.2 km/s V6371 SiII (6371Å) radial velocity
48- 51 F4.2 km/s sigma The 1σ uncertainty in the radial velocity
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date of observation
14- 18 F5.3 mag umag Stromgren u band magnitude
20- 24 F5.3 mag vmag Stromgren v band magnitude
26- 30 F5.3 mag bmag Stromgren b band magnitude
32- 36 F5.3 mag ymag Stromgren y band magnitude
38- 42 F5.3 mag u-b Stromgren (u-b) color index
44- 49 F6.3 mag b-y Stromgren (b-y) color index
51- 55 F5.3 mag c1 Stromgren c1 index
57- 61 F5.3 mag m1 Stromgren m1 index
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 18-Jul-2012