J/MNRAS/447/1673 Galactic post-AGB stars distances (Vickers+, 2015)
New light on Galactic post-asymptotic giant branch stars.
I. First distance catalogue.
Vickers S.B., Frew D.J., Parker Q.A., Bojicic I.S.
<Mon. Not. R. Astron. Soc., 447, 1673-1691 (2015)>
=2015MNRAS.447.1673V 2015MNRAS.447.1673V (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Stars, distances
Keywords: techniques: photometric - techniques: spectroscopic -
stars: AGB and post-AGB - stars: distances - stars: evolution -
planetary nebulae: general
Abstract:
We have commenced a detailed analysis of the known sample of Galactic
post-asymptotic giant branch (PAGB) objects compiled in the Torun
catalogue of Szczerba et al. (2007A&A...469..799S 2007A&A...469..799S, Cat.
J/A+A/469/799), and present, for the first time, homogeneously derived
distance determinations for the 209 likely and 87 possible catalogued
PAGB stars from that compilation. Knowing distances are essential in
determining meaningful physical characteristics for these sources and
this has been difficult to determine for most objects previously. The
distances were determined by modelling their spectral energy
distributions (SEDs) with multiple blackbody curves, and integrating
under the overall fit to determine the total distance-dependent flux.
This approach was undertaken for consistency as precise spectral
types, needed for more detailed fitting, were unknown in the majority
of cases. The SED method works because the luminosity of these central
stars is very nearly constant from the tip of the AGB phase to the
beginning of the white dwarf cooling track. This then enables us to
use a standard-candle luminosity to estimate the SED distances. For
Galactic thin-disc PAGB objects, we use three luminosity bins based on
typical observational characteristics, ranging between 3500 and
12000L☉. We further adopt a default luminosity of 4000L☉
for bulge objects and 1700L☉ for the thick-disc and halo
objects. We have also applied the above technique to a further sample
of 54 related nebulae not in the current edition of the Torun
catalogue. In a follow-up paper, we will estimate distances to the
subset of RV Tauri variables using empirical period-luminosity
relations, and to the R CrB stars, allowing a population comparison of
these objects with the other subclasses of PAGB stars for the first
time.
Description:
The Torun catalogue provides easy online access to processed
photometric and spectroscopic data for the currently identified
Galactic population of PAGB stars and related objects. The catalogue
is divided into five categories: (i) very-likely PAGB stars, (ii) RV
Tauri stars, (iii) R Coronae Borealis/extreme helium/late thermal
pulse stars, (iv) possible PAGB stars and (v) unlikely PAGB objects.
Hereafter, likely PAGB stars will be referred to simply as PAGB, R
Coronae Borealis/extreme helium/late thermal pulse as R CrB/eHe/LTP,
while the possible PAGB objects will be simply referred to as
possible. We will present a distance catalogue of the R Tau and R
CrB/eHe/LTP stars in a second paper (Vickers et al., in preparation),
concentrating on the likely and possible PAGB objects in this work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 144 209 Derived Parameters and distances for 209 likely
PAGB stars in the Torun catalogue, ordered by
Galactic longitude (table 4 in the paper)
table5.dat 144 87 Derived Parameters and distances for 87 possible
PAGB stars in the Torun catalogue, ordered by
Galactic longitude
table6.dat 144 54 Derived Parameters and distances for 54
miscellaneous objects not in the Torun
Catalogue, ordered by Galactic longitude
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See also:
J/A+A/469/799 : Torun catalog of post-AGB and related objects (Szczerba+, 2007)
Byte-by-byte Description of file: table[456].dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- IRAS IRAS designation
13- 34 A22 --- OName Other name
35- 41 F7.3 deg GLON Galactic longitude
44- 50 F7.3 deg GLAT Galactic latitude
52- 59 E8.3 mW/m2 Flux Total integrated flux in erg/s/cm2
61- 68 E8.3 mW/m2 e_Flux rms uncertainty on Flux
69- 78 F10.2 Lsun/kpc2 Flux2 Total integrated flux in L_☉/kpc2
80- 88 F9.2 Lsun/kpc2 e_Flux2 rms uncertainty on Flux2
90- 94 I5 Lsun Lum Adopted luminosity
96- 99 I4 Lsun e_Lum rms uncertainty on Lum
101-104 F4.2 mag E(B-V) Estimated reddening
106-109 F4.2 mag e_E(B-V) rms uncertainty on E(B-V)
111-115 F5.2 kpc Dist Derived distance
117-120 F4.2 kpc e_Dist rms uncertainty on Distance
122-130 F9.2 --- FIR/F* ?=- Infrared-to-stellar flux ratio after
reddening correction
132-135 I4 K TD ? Dust temperature or lower value if interval
136 A1 --- --- [-]
137-140 I4 K TDu ? Upper value of dust temperature interval
142-144 I3 K e_TD ? rms uncertainty on TD
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Jul-2015