J/AJ/160/52 Spectral classification for 631 ρPuppis stars (McGahee+, 2020)
A spectroscopic classification survey to search for new ρPuppis stars.
McGahee C., Gray R.O., Griffin R.E.M., Birchard M., Day J.
<Astron. J., 160, 52 (2020)>
=2020AJ....160...52M 2020AJ....160...52M
ADC_Keywords: Surveys; Stars, F-type; Spectra, optical; Spectral types;
Keywords: Stellar classification ; Chemically peculiar stars ; Am stars ;
Barium stars
Abstract:
The ρPuppis stars are mid-F-type stars that show peculiar
chemical-abundance patterns similar to those of the Am stars.
Typically they exhibit overabundances of iron-peak elements such as Fe
and Ni and s- and r-process elements such as Sr and Eu, and
underabundances of certain other elements including He, Ca, and Sc. It
has been proposed that these stars are evolving Am stars passing
through the short-lived phase that occurs between the re-establishment
of convection and the consequent erasure of their chemical
peculiarities. In this paper we suggest a second hypothesis: these
stars may have acquired their peculiar abundance patterns in a fashion
similar to the Barium stars, i.e., they may have gained the s-process
element enhancements via mass transfer from a once asymptotic
giant-branch companion star, now turned white dwarf. This study will
detail our efforts to investigate the ρPuppis stars with regard to
these two hypotheses, with a view to understanding these stars and
their significance in terms of stellar evolution. We have performed a
spectral classification survey, and a detailed chemical-abundance
analysis of selected ρPuppis stars. This paper gives an overview
of the ρPuppis stars and describes the spectral classification
survey which has increased the number of ρPuppis stars currently
known from 6 to 49. A future paper will describe the
chemical-abundance analysis which should provide insight into the
nature of these stars.
Description:
Classification-resolution spectra of 631 of the ρPuppis candidates
were obtained with the Gray-Miller Cassegrain spectrograph on the
0.8m DFM Engineering telescope of Appalachian State University's Dark
Sky Observatory (DSO), located in the Blue Ridge mountains of North
Carolina. The 600 and 1200 grooves/millimeter gratings were used in
conjunction with a 100µm wide slit to produce 3.6 and 1.8Å/2
pixel resolutions (R=1300 and 2300) with spectral ranges of 3800-5600
and 3800-4600Å respectively. Exposure times were calculated so as
to achieve a signal-to-noise ratio (S/N)>100.
We present our spectral classifications and the broader, corresponding
classification families for the ρPuppis candidates observed at the
DSO for stars selected from the the Mermilliod Catalog
(Mermilliod+, 1997A&AS..124..349M 1997A&AS..124..349M), and for stars selected from the
Michigan HD reclassification project catalogs (Houk+, 1973IAUS...50...70H 1973IAUS...50...70H).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 240 575 Spectral classifications and notes for stars
selected from the mermilliod catalog
table3.dat 240 56 Spectral classifications and notes for stars
selected from the Michigan HD-reclassification
project (Houk)
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See also:
B/pastel : The PASTEL catalogue (Soubiran+, 2016-)
I/211 : Components of Double and Multiple stars (Dommanget+, 1994)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+AS/137/451 : Radial velocities. IX. (Grenier+, 1999)
J/AJ/120/2638 : CCD speckle obs. of binary stars. II. (Horch+, 2000)
J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)
J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)
J/AJ/131/3008 : Double star speckle measures (Horch+, 2006)
J/A+A/545/A121 : o Puppis spectra (Koubsky+, 2012)
J/AJ/149/8 : RV of southern visual multiple stars (Tokovinin+, 2015)
J/AJ/149/59 : Abundances of ρ Pup (Yushchenko+, 2015)
J/MNRAS/459/4299 : Barium stars abundances and kinematics (de Castro+, 2016)
J/AJ/152/207 : Spectroscopic Indicators in SeisMic Archive (Rainer+, 2016)
J/A+A/608/A100 : CMD and mass distribution of Ba stars (Escorza+, 2017)
J/MNRAS/466/546 : Parameters for the 172 λ Boo stars (Murphy+, 2017)
J/A+A/610/A17 : RV of candidate hybrid variable stars (Lampens+, 2018)
J/MNRAS/474/4322 : Orbital parameters of 341 new binaries (Murphy+, 2018)
J/A+A/626/A128 : Main-sequence and subgiant Barium stars (Escorza+, 2019)
Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- HD HD number
9- 17 F9.5 --- BD ? BD identifier (BD +DD NNNNN)
19- 24 F6.3 mag Vmag ? Apparent V band magnitude
26- 38 A13 --- Class Classification family
40- 64 A25 --- SpType Spectral classification
66-240 A175 --- Notes Additional notes
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie FIX [CDS], 19-Oct-2020