Return to Home Page
A recent paper by Chen & Chen contains analysis of IRAS spectra to
identify new carbon stars. In many cases they provide candidate visible-light
identifications, apparently based on the USNO-A1.0 star catalogue. I have
gone through the list to see if I could improve on these. Many of their
choices for stars appear to be wrong, as is clearly evident from the 2MASS
catalogue, or from the improved positions available from the MSX mid-infrared
catalogue. (I should note that the erroneous visible-light IDs are not
important for the purposes of the Chen & Chen paper, which concerns itself
chiefly with analysis of the IRAS spectra.)
The revised positions and identifications are collected below. In a few
cases only the original IRAS position seems to be available, and for many more
the best are from MSX, which are typically uncertain by +/- 5" or so. It is
possible to be definitive (or nearly) when there is an unsaturated 2MASS
detection with large J-K color (some spectacularly so in my experience),
or USNO-B1.0 objects with r-i > 2 and "large" b-r color (when b is present
at all). Not every IRAS source has a clear visible/near-IR counterpart,
and all the uncertain cases are noted in the remarks.
When the remark "wrong" is given, it means the Chen & Chen ID from A1.0
is almost certainly in error---usually they have chosen a faint star of
ordinary color, sometimes also well outside the IRAS position error-ellipses.
Where a comment starts "MacC: ", what follows is the spectral type determined
by Jack MacConnell in a semi-published file available from the Strasbourg
catalogue server (http://vizier.u-strasbg.fr/viz-bin/Cat?III/170). It seems
likely that most of the "possible" and "suspect" carbon stars are either
ordinary M-type or (unusual) post-AGB objects, the latter having IRAS fluxes
unlike those of ordinary late-type stars.
Rough magnitudes (usually in the red band) are taken mostly from GSC-2.2
or USNO-B1.0; these are not intended to be other than indicative of the
general brightness.
Like a lot of similar things, more conclusive results will await the
appearance of the final 2MASS catalogues on VizieR.
\Brian
-------------------------------------------------------------------------------
Improved coordinates and visible/near-IR identifications for
some carbon-star candidates among IRAS sources
version: 12 Apr 2003
source: 2003AJ....125.2215C
CHEN P.-S. and CHEN W.-P.
Astron. J., 125, 2215-2226 (2003)
Newly identified carbon stars from the IRAS low-resolution spectra.
position sources (column 's'):
b USNO-B1.0 (2003AJ....125..984M, I/284)
D DENIS (1999A&A...349..236E, b/denis)
G GSC-ACT (1999GSCTy.C......0G, I/255)
g GSC-2.2 (2001GSC2..C......0S, I/271)
M 2MASS second release (20002MASS.2.......:, B/2mass/out)
T Tycho-2 (2000A&A...357..367H, I/259)
U UCAC1 (2000AJ....120.2131Z, I/268)
X MSX (2001AJ....121.2819P, V/107; +/- ~5")
certain C stars
Name RA (J2000) Dec s mag spec remarks
IRAS 04340+4623 4 37 42.03 +46 29 30.6 M C
IRAS 05261+4626 5 29 53.16 +46 28 54.2 b 19.5 R C vis ID uncer
IRAS 06447+0817 6 47 24.98 +08 13 58.9 b 17.9 R C NSV 17188
IRAS 07113-0025 7 13 53.05 -00 30 59.3 M 14.9 R C CGCS 6208
IRAS 15261-5702 15 30 01.4 -57 12 50 X C
IRAS 16373-4732 16 41 02.3 -47 37 51 X C
IRAS 17092-3905 17 12 39.2 -39 09 19 X C
IRAS 18240+2326 18 26 05.85 +23 28 42.2 b 20.5 B C vis ID uncer
IRAS 18244-0815 18 27 07.5 -08 13 07 X C
IRAS 19029+0839 19 05 21.1 +08 43 58 X C
IRAS 20159+3134 20 17 58.59 +31 44 15.8 M C
IRAS 20340+5338* 20 35 27.77 +53 49 22.6 b 15. R C NSV 25184
IRAS 21265+5042 21 28 13.8 +50 55 24 X C
IRAS 03156+5828 3 19 37.8 +58 39 46 X C
IRAS 04297+2941 4 32 53.16 +29 48 04.6 M 17.2 R C
IRAS 05342+4439 5 37 56.98 +44 41 00.5 b 14.4 R C
IRAS 05521-2242 5 54 12.41 -22 41 47.4 U 10.0 R C
IRAS 06196-2409 6 21 40.25 -24 11 25.8 M 15.5 R C
IRAS 06585-4111 7 00 11.70 -41 15 58.5 U 12.7 R C
IRAS 07036-2220 7 05 44.08 -22 25 07.8 M 17.4 R C wrong
IRAS 07085-0018 7 11 07.28 -00 23 12.8 M 18.8 R C wrong
IRAS 07593-1452 8 01 39.23 -15 01 00.5 M 10.0 R C
IRAS 08017-3651 8 03 37.97 -37 00 24.7 M 17.4 R C
IRAS 08107-3355 8 12 41.28 -34 04 59.4 M 13.9 R C
IRAS 08195-4027 8 21 17.18 -40 37 03.2 b 16.9 R C
IRAS 08546-4350 8 56 24.00 -44 02 31.1 b 18.0 R C wrong
IRAS 09006-5310 9 02 12.47 -53 21 58.8 b 16.7 R C wrong
IRAS 09088-5050 9 10 28.01 -51 02 32.4 D 14.5 R C wrong
IRAS 09238-5309 9 25 27.2 -53 22 42 X C vis ID uncer
IRAS 10130-5703 10 14 49.21 -57 18 45.0 g 14.7 R C wrong, MacC: M4 or S?
IRAS 10255-5559 10 27 28.3 -56 15 07 X C wrong
IRAS 10591-5848 11 01 15.51 -59 05 10.9 b 18.0 R C wrong
IRAS 11079-6211 11 10 03.6 -62 27 45 X C
IRAS 11496-6136 11 52 08.7 -61 53 44 X C vis ID uncer
IRAS 12142-6410 12 16 59.67 -64 27 12.1 U 12.0 R C red/blue binary?
IRAS 12352-6317 12 38 09.7 -63 33 44 X C wrong, vis ID uncer
IRAS 12407-6234 12 43 43.76 -62 51 01.9 b 17.7 R C wrong; MacC: carbon
IRAS 12533-6118 12 56 26.4 -61 34 40 X C wrong, no vis ID?
IRAS 14358-6303* 14 39 48.93 -63 16 08.6 b 11.5 R C wrong, crowded
IRAS 14457-5836 14 49 30.7 -58 49 13 X C wrong, no vis ID?
IRAS 15312-5821 15 35 18.3 -58 31 34 X C wrong? vis ID uncer
IRAS 16081-5042 16 11 55.85 -50 50 21.7 b 15.6 R C wrong?
IRAS 16409-4500 16 49 36.24 -45 04 39.9 U 9.1 V C HD 328931 (K0)
IRAS 16473-4041 16 50 47.25 -40 46 13.2 U 15.0 R C
IRAS 17120-3939 17 15 31.7 -39 43 06 X C wrong, no vis ID?
IRAS 17151-3629 17 18 32.13 -36 32 28.0 b 19. R C wrong
IRAS 17199-3512 17 23 18.01 -35 15 37.6 M C
IRAS 18008-2840 18 04 02.2 -28 40 41 X C wrong? vis ID uncer
IRAS 18110-1909* 18 13 57.72 -19 08 24.4 U 14.1 R C wrong, vis ID uncer
IRAS 18250-1818 18 27 57.92 -18 16 08.6 M 15.2 R C wrong
IRAS 18356-0951 18 38 25.1 -09 49 01 X C wrong
IRAS 18379-0417 18 40 33.86 -04 14 50.2 b 17.2 R C wrong
IRAS 18487+0135* 18 51 15.35 +01 39 15.7 b 19. R C vis ID uncer
IRAS 18542+0430 18 56 42.51 +04 34 14.0 b 19.4 R C wrong? vis ID uncer
IRAS 19109+0657 19 13 24.38 +07 02 59.5 b 16. R C wrong? vis ID uncer
IRAS 19151+1037 19 17 29.5 +10 43 27 X C vis ID uncer
IRAS 19236+2404 19 25 45.62 +24 11 07.8 M C wrong, 2MASS saturated
IRAS 19293+2002 19 31 29.31 +20 08 33.4 M C wrong
IRAS 19317+2159 19 33 53.35 +22 05 55.9 M C
IRAS 19363+2652 19 38 21.35 +26 59 05.4 M 16.9 R C vis ID uncer
IRAS 19399+2404 19 42 03.01 +24 11 50.3 M 17.5 R C wrong
IRAS 19455+2319 19 47 39.84 +23 26 39.5 G 12.6 R C
IRAS 19470+2603 19 49 09.46 +26 11 12.1 T 11.3 R C not red
IRAS 19485+3235 19 50 28.3 +32 43 35 X C wrong? vis ID uncer
IRAS 19535+2635 19 55 36.42 +26 43 02.2 b 18.7 R C wrong, IRAS pos poor
IRAS 19541+2807 19 56 10.8 +28 15 10 X C wrong, vis ID uncer
IRAS 20080+4022 20 09 49.58 +40 31 04.4 M C wrong, 2MASS saturated
IRAS 20108+3347 20 12 47.65 +33 56 39.4 b 13.8 R C wrong, vis ID uncer?
IRAS 20185+3848 20 20 21.51 +38 58 31.1 M C
IRAS 20228+3558 20 24 43.92 +36 08 15.6 M C
IRAS 20333+3746 20 35 14.99 +37 57 16.6 b 19. R C wrong, 2MASS saturated
IRAS 20379+4036 20 39 47.55 +40 47 04.1 M C
IRAS 20391+4023 20 40 58.42 +40 33 47.8 M C wrong
IRAS 20424+5921 20 43 36.89 +59 32 52.3 b 17.3 R C
IRAS 22395+5831 22 41 30.49 +58 47 22.1 b 16.9 R C
IRAS 22562+6310 22 58 15.29 +63 26 35.0 M 17.4 R C
possible C stars
Name RA (J2000) Dec s mag spec remarks
IRAS 00050+7357 0 07 43.19 +74 14 10.9 g 12.6 R C: wrong
IRAS 01022+6542 1 05 27.44 +65 58 59.6 g 14.5 R C:
IRAS 01327+6503 1 36 18.46 +65 18 37.3 g 14.8 R C:
IRAS 06242+2830 6 24 15.2 +28 30 20 I C:
IRAS 07439-3612* 7 45 45.58 -36 19 48.4 M C: wrong
IRAS 08151-3934 8 16 59.6 -39 43 43 X C: no vis ID
IRAS 08363-4837 8 37 55.60 -48 48 07.2 U 9.3 V C: MacC: M5; CD-48 3960
IRAS 10239-5818* 10 25 44.50 -58 33 52.2 U 10.8 V C: MacC: M4
IRAS 11251-5946 11 27 25.46 -60 03 15.8 b 12.9 R C: wrong? vis ID uncer
IRAS 13366-6338 13 40 08.67 -63 54 02.8 G 10.7 R C: MacC: M7
IRAS 14063-6104* 14 09 57.3 -61 18 34 I C: no vis ID?
IRAS 16229-4947* 16 26 41.3 -49 54 24 X C: no vis ID?
IRAS 16567-2408* 16 59 43.78 -24 12 46.8 M C: wrong? vis ID uncer
IRAS 17252-3359 17 28 35.84 -34 01 23.8 M C: wrong
IRAS 17314-3314 17 34 42.34 -33 16 18.1 M C: wrong
IRAS 17594-1910* 18 02 28.29 -19 10 25.0 U 10.8 R C: wrong, HD 312502
IRAS 19118+1020* 19 14 11.29 +10 25 51.5 g 16.7 R C: wrong
IRAS 19240+2322 19 26 08.6 +23 28 47 X C: wrong
IRAS 20091+3645 20 10 59.26 +36 54 19.5 M C: wrong
IRAS 21136+5705 21 15 02.58 +57 18 06.4 g 15. R C:
IRAS 21167+5148 21 18 25.53 +52 01 19.3 M C:
IRAS 23086+6325 23 10 45.10 +63 42 10.2 g 16.5 R C: wrong
IRAS 23148+6836 23 16 49.46 +68 52 44.9 g 17.5 R C:
IRAS 23183+6151 23 20 34.8 +62 08 11 X C: vis ID uncer
suspect C stars
Name RA (J2000) Dec s mag spec remarks
IRAS 12139-6103 12 16 39.2 -61 20 24 X C? wrong
IRAS 13064-6433* 13 09 40.79 -64 50 05.2 b 20.5 R C? wrong, vis ID uncer
IRAS 14061-5839 14 09 39.1 -58 53 54 X C? wrong
IRAS 15057-5934 15 09 40.6 -59 46 05 X C? wrong, vis ID uncer
IRAS 16136-5020* 16 17 25.7 -50 27 20 X C? wrong, vis ID uncer
IRAS 16210-4957 16 24 46.7 -50 03 49 X C? wrong?
IRAS 16455-4349 16 49 09.1 -43 54 57 X C? wrong
IRAS 16458-4425 16 49 26.2 -44 30 24 X C? wrong
IRAS 16589-4024 17 02 28.04 -40 28 52.5 b 16.7 R C?
IRAS 18040-2028 18 07 04.0 -20 28 07 X C? wrong
IRAS 18111-1645 18 14 00.7 -16 44 18 X C? wrong
IRAS 19315+1807 19 33 46.03 +18 13 56.7 M C? wrong
IRAS 19429+2721 19 44 56.88 +27 28 34.9 b 19.6 R C? wrong
Notes
certain C stars
IRAS 20340+5338 MSX position greatly in error?
IRAS 14358-6303 vis ID uncer.
IRAS 18110-1909 2MASS saturated.
IRAS 18487+0135 large proper motion in USNO-B1.0 probably spurious.
possible C stars
IRAS 07439-3612 2MASS saturated; MacC: early M, probably is for less-red
star 20" north.
IRAS 10239-5818 evidently VV Cep-type.
IRAS 14063-6104 not carbon? IRAS 12/25mu = 1.
IRAS 16229-4947 not carbon? IRAS 12/25mu < 1.
IRAS 16567-2408 2MASS saturated.
IRAS 17594-1910 IRAS position poor.
IRAS 19118+1020 northwestern star of 5" pair.
suspect C stars
IRAS 13064-6433 not carbon? IRAS 12/25mu = 1.
IRAS 16136-5020 not carbon? IRAS 12/25mu = 1.
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
