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J/A+AS/93/121    CO emission from a sample of IRAS sources         (Nyman+ 1992)
A survey of circumstellar CO emission from a sample of IRAS sources
     Nyman L.A., Booth R.S., Carlstroem U., Habing H.J., Heske A., Sahai R.,
     Stark R., van der Veen W.E.C.J., Winnberg A.
    <Astron. Astrophys. Suppl. Ser. 93, 121 (1992)>
    =1992A&AS...93..121N
ADC_Keywords: Infrared sources; CO; Stars, late-type; Mass loss

Keywords: stars: circumstellar matter - stars: mass loss - radio lines:
        molecular (CO) - infrared radiation

Abstract:
    The first results from a survey of circumstellar CO(1-0) emission
    are presented. The sources were selected from the IRAS point source
    catalog according to the IRAS color criteria described in van der Veen
    and Habing (1988A&A...194..125V). The sources have good quality fluxes
    at 12, 25, and 60 microns, flux densities larger than 20Jy at 25µm,
    and are situated more than 5° away from the Galactic plane. The
    survey is undertaken to study the relationship between mass loss
    rates, dust properties, and the evolution along the AGB. The sample
    consists of 787 sources and contains both oxygen and carbon-rich
    stars, including Mira variables, OH/IR objects, protoplanetary
    nebulae, planetary nebulae, and 60-micron excess sources. So far, 519
    objects, situated on both the northern and the southern sky, have been
    observed; 163 sources were found to have circumstellar CO emission,
    and in 58 of these CO emission has not previously been detected.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table4.dat        90      519   Detected and undetected sources
table6.dat        70      103   Objects with cold envelopes


Byte-by-byte Description of file: table4.dat

   Bytes Format  Units   Label    Explanations

       1  A1     ---     T        [abc] Table indicator: a=detected, 
                                        b=tentative, c=not detected.
   2- 12  A11    ---     IRAS     IRAS Source Name
  13- 16  A4     ---     Region   in the IRAS two color diagram as defined by
                                   van der Veen & Habing, 1988A&A...194..125V
  18- 23  F6.0   Jy      F12      IRAS 12 micrometer flux density
  25- 30  F6.0   Jy      F25      IRAS 25 micrometer flux density
  32- 37  F6.0   Jy      F60      IRAS 60 micrometer flux density
  39- 43  F5.3   K       rms      ? Rms noise the CO spectrum, given in K (Tmb).
  45- 49  F5.2   K       Tmb      ? Main beam brightness peak intensity of the
                                    detected line
  51- 56  F6.1   km/s    V0       ? Center velocity of the CO line (in km/s).
      57  A1     ---     n_V0     [ab] Remark on V0 (1)
  59- 62  F4.1   km/s    Vexp     ? Expansion velocity. This is half of the
                                    full line width at zero intensity.
  64- 68  F5.1   K.km/s  Ico      ? CO intensity integrated over the whole line
                                    (in K.km/s, Tmb scale).
  70- 71  I2     ---     Ref      ? Reference to a previous CO detection of
                                    the source. (2)
  73- 90  A18    ---     Ident    Source name if differs from the IRAS name.
                                   An asterisk after the name indicates that
                                   there is an interstellar line included in
                                   the CO spectrum.

Note (1): Note as follows:
   a = The centre velocity is uncertain up to ±10 kms-1 (see text).
   b = Previous CO detections. For sources previously detected in CO(1-0)
       emission and not detected by us, the CO(1-0) line was usually too
       weak to be seen with our sensitivity limit, and in a few cases it
       may only have been a tentative detection. Sources detected in the
       CO(2-1) line are also listed as previous detections.
       The CO(2-1) line can be brighter than the (1-0) line
       because of optical depth and beam filling effects, and the
       (1-0) line may be too weak to be detected.
Note (2): References are numbered as follows:
    1 = Knapp & Morris (1985ApJ...292..640K),
    2 = Zuckerman et al. (1986ApJ...304..401Z),
    3 = Zuckerman & Dyck (1986ApJ...304..394Z),
    4 = Zuckerman & Dyck (1986ApJ...311..345Z),
    5 = Zuckerman & Dyck (1989A&A...209..119Z),
    6 = Olofsson et al. (1987A&A...183L..13O),
    7 = Olofsson et al. (1988A&A...196L...1O),
    8 = Sopka et al. (1989A&A...210...78S),
    9 = Lindqvist et al. (1988A&A...205L..15L),
   10 = Wannier & Sahai (1986ApJ...311..335W),
   11 = Nguyen-Q-Rieu et al. (1987A&A...180..117N),
   12 = Knapp et al. (1982ApJ...252..616K),
   13 = Likkel et al. (1987A&A...173L..11L),
   14 = Knapp et al. (1989ApJ...336..822K),
   15 = Deguchi et al. (1990A&A...230..339D),
   16 = Loup et al. (1990A&A...227L..29L),
   17 = Heske et al. (1990A&A...239..173H),
   18 = Huggins & Healy (1989ApJ...346..201H),
   19 = Woodsworth et al. (1990A&A...228..503W),
   20 = Margulis et al. (1990ApJ...361..673M),
   21 = Knapp (1986ApJ...311..731K),
   22 = Leahy et al. (1987ApJ...320..825L),
   23 = Arquilla et al. (1986MNRAS.220..125A)


Table 5: CO parameters as function of IRAS regions
    ------------------------------------------------------------------
    Region  v_exp   Dv_exp  K_60    ±     A_60    ±     r_60    n
    ------------------------------------------------------------------
    II      11.4    5.4     0.64    0.19    -0.48   0.28    0.63    19
    IIIa    14.5    4.0     0.87    0.06    -0.76   0.09    0.88    67
    IIIb    17.2    3.7     0.68    0.20    -0.51   0.30    0.79    9
    IV      18.9
    V       12.7    2.0
    VIa     16.1    8.9     1.03    0.18    -0.67   0.21    0.92    8
    VIb     17.7
    VII     16.6    6.6     0.91    0.07    -0.50   0.10    0.87    50
    ------------------------------------------------------------------
    r_60 is the correlation coefficient to the fit
    log(ICO)=K60.log(F60)+A60
    and n is the number of sources included in the fit.

Byte-by-byte Description of file: table6.dat

   Bytes Format  Units   Label    Explanations

   1- 11  A11    ---     IRAS     IRAS Source Name
  12- 15  A4     ---     Region   in the IRAS two color diagram as defined by
                                   van der Veen & Habing, 1988A&A...194..125V
  17- 18  A2     ---     Det      Detection, as:
                                   D = Detected by us;
                                   ? = Tentative detection;
                                   N = Non-detection;
                                   * = Interstellar line in the CO spectrum.
  20- 21  I2     ---     r_Det    ? Reference to previous detection (1)
  23- 58  A36    ---     Ident    Identification
  61- 65  A5     ---     SpType   MK spectral type
  67- 70  A4     ---     r_Id     Reference to Identification (1)

Note (1): References are numbered as follows:
    1 = Zijlstra et al. (1989A&A...217..157Z)
    2 = Volk & Kwok (1989ApJ...342..345V)
    3 = Kwok et al. (1989ApJ...345L..51K)
    4 = te Lintel Hekkert et al. (1988A&A...202L..19T)
    5 = Hrivnak et al. (1988ApJ...331..832H)
    6 = Cernicharo et al. (1989A&A...222L...1C)
    7 = Cohen & Schwarz (1984AJ.....89..277C)
    8 = Beichman et al. (1986ApJ...307..337B)
    9 = Gaylard et al. (1989MNRAS.236..247G)
   10 = te Lintel Hekkert et al. (1989A&AS...78..399T)
   11 = Menzies & Wolstencroft (1990MNRAS.247..177M)
   12 = Hu et al. (1989A&A...208..213H)
   13 = Hu et al. (1990fmpn.coll..487H)
   14 = Rao et al. (1990A&A...234..410K)
   15 = Lambert et al. (1986ApJS...62..373L)
   16 = Heske et al. (1990A&A...239..173H)
   17 = Olofsson et al. (1987A&A...183L..13O)
   18 = Woodsworth et al. (1990A&A...228..503W)
   19 = Sopka et al. (1989A&A...210...78S)
   20 = Knapp & Morris (1985ApJ...292..640K)
   21 = Loup et al. (1990A&A...227L..29L)
   22 = Zuckerman et al. (1986ApJ...304..401Z)
   23 = Olofsson et al. (1988A&A...196L...1O)
   24 = Knapp et al. (1989ApJ...336..822K)
   25 = Zuckerman & Dyck (1986ApJ...311..345Z)
   26 = Huggins & Healy (1989ApJ...346..201H)
   27 = Likkel et al. (1987A&A...173L..11L)
   28 = Zuckerman & Dyck (1986ApJ...304..394Z)
   29 = Arquilla et al. (1986MNRAS.220..125A)
   30 = Pesce et al., in "A Decade of UV Astronomy with the IUE Satellite"
        (1988uvai....1..253P).

(End)                                           [CDS]                19-Mar-1993