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J/A+A/306/9         PNe and HII in NGC 300                   (Soffner+, 1996)
Planetary nebulae and HII regions in NGC 300.
    Soffner T., Mendez R.H., Jacoby G.H., Ciardullo R., Roth M.M.,
    Kudritzki R.P.
   <Astron. Astrophys. 306, 9 (1996)>
   =1996A&A...306....9S
ADC_Keywords: Planetary nebulae

Keywords: galaxies: individual (NGC 300), ISM, distances -
          planetary nebulae: general, luminosity function

Abstract:
    We report a search for planetary nebulae and H II regions in the
    central part of the late-type spiral NGC 300, using a CCD and the
    on-band/off-band filter technique. The total exposure time for all
    frames was 4 hours. We have identified 34 PNs and 88 H II regions. We
    construct the cumulative [O III] λ5007 PN luminosity function
    (PNLF) and obtain a distance modulus of 26.9±0.4, in satisfactory
    agreement with the Cepheid distance modulus (26.7±0.1). We make a
    general comparison between Cepheid and PNLF distances, showing that
    they are in excellent overall agreement. NGC 300 is in principle one
    of the best possible calibrators of the PNLF method of distance
    determination, to be preferentially applied, like the LMC, in cases of
    populations with recent star formation (as opposed to the bulge of
    M 31, which has served as calibrator for populations without recent
    star formation).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        58       38   Planetary nebulae in NGC 300
tab3-5.dat        79       90   H II regions in NGC 300


See also:
  J/ApJ/339/53  : Planetary nebulae as standard candles. II. (Ciardullo+, 1989)
  J/ApJ/344/704 : Planetary nebulae as standard candles. III. (Jacoby+, 1989)
  J/ApJ/344/715 : Planetary nebulae as standard candles. IV. (Ciardullo+, 1989)
  J/ApJ/356/332 : Planetary nebulae as standard candles. V. (Jacoby+, 1990)
  J/ApJ/365/471 : Planetary nebulae as standard candles. VI. (Jacoby+, 1990)
  J/ApJ/383/487 : Planetary nebulae as standard candles. VII. (Ciardullo+, 1991)
  J/ApJ/416/62  : Planetary nebulae as standard candles. IX. (McMillan+, 1993)
  J/ApJ/462/1   : Planetary nebulae as standard candles. X. (Jacoby+, 1996)
  J/ApJ/479/231 : Planetary nebulae as standard candles. XI. (Feldmeier+, 1996)
  J/ApJ/577/31  : Planetary nebulae as standard candles. XII. (Ciardullo+, 2002)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units      Label     Explanations

   1-  2  I2    ---        PN        PN number in the galaxy ([SMJ96] PN NN)
       4  A1    ---        Field     [ECW] Field designation
   6- 11  F6.2  pix        Xpos      X position
  13- 18  F6.2  pix        Ypos      Y position
  20- 21  I2    h          RAh       Right ascension (J2000)
  23- 24  I2    min        RAm       Right ascension (J2000)
  26- 29  F4.1  s          RAs       Right ascension (J2000)
      31  A1    ---        DE-       Declination sign (J2000)
  32- 33  I2    deg        DEd       Declination (J2000)
  35- 36  I2    arcmin     DEm       Declination (J2000)
  38- 41  F4.1  arcsec     DEs       Declination (J2000)
  43- 47  F5.2  mag        m5007     ? m5007Å magnitude (1)
  49- 52  F4.2  mag        e_m5007   ? rms uncertainty on m5007
  54- 58  F5.2  10-19W/m2 I(Halpha)  ? Hα intensity

Note (1): m5007 = -2.5log(I5007) - 13.74



Byte-by-byte Description of file: tab3-5.dat

   Bytes Format Units     Label     Explanations

       1  A1    ---       Field     [ECW] Field designation (1)
   2-  3  I2    ---       HII       H II number in the field (1)
       6  I1    h         RAh       Right ascension (J2000)
   8-  9  I2    min       RAm       Right ascension (J2000)
  11- 14  F4.1  s         RAs       Right ascension (J2000)
      16  A1    ---       DE-       Declination sign (J2000)
  17- 18  I2    deg       DEd       Declination (J2000)
  20- 21  I2    arcmin    DEm       Declination (J2000)
  23- 26  F4.1  arcsec    DEs       Declination (J2000)
  28- 30  I3    pix       Xpos      X position
  32- 34  I3    pix       Ypos      Y position
  36- 38  I3    pix       Size      Size in pixels
  40- 45  F6.1  10-19W/m2 I(Halpha)  ? Hα intensity
  47- 51  F5.1  10-19W/m2 I(5007)   ? 5007Å line intensity
  53- 56  F4.1  %         DI(5007)  ? Relative 5007Å line intensity
  58- 71  A14   ---       Notes     Description and notes (2)
  73- 79  A7    ---       Name      Other name (D NNN = [DCL88] NNN in Simbad)

Note (1): In Simbad, HII regions identified as [SMJ96] HII CNN
          C 1 = E25; W 1 = C32
Note (2): In a few cases the flux given are the addition of fluxes
     from two adjacent objects. These cases are marked by giving both 
     objects numbers, joined by a + sign.

     The excitation classes L, M and H correspond to low, medium and high
     excitation, respectively.

     Notes:
     1: starlike source, but star visible on "off"-band; therefore the
        object is rejected as a PN
     2: elongated
     3: the object may be a very low-excitation PN. Poor seeing does not
        permit to decide.
     4: object too close to edge of frame; fluxes not measured
     5: adjacent objects could not be separated; fluxes not measured


Table 6 : Comparison of Cepheid and PNLF distances
--------------------------------------------------------------------------------
 Galaxy       E(B-V)     D(PNLF)     Ref  E(B-V)   D(Cepheid)      Ref
              PNLF        Mpc             Cepheid     Mpc
--------------------------------------------------------------------------------
  LMC         0.10   0.050± 0.005    1  0.14    0.050± 0.003    2.3
  M 31        0.08   0.77 ± 0.04     4  vary    0.77 ± 0.04     5
  NGC 300     0.00   2.40 ± 0.48     -  0.00    2.19 ± 0.11     6
  M 81        0.10   3.60 ± 0.44     7  0.03    3.63 ± 0.34     8
  NGC 5253    0.05   3.73 ± 0.57 b   9  0.05    3.87 ± 0.28 c  10
  Virgo/4571  0.02  15.42 ± 1.03    11  0.00   14.90 ± 1.20    12
  Virgo/4321  0.02  15.42 ± 1.03    11  0.05   17.10 ± 1.80    13
--------------------------------------------------------------------------------
 Notes: 
     a: All planetary nebula luminosity function (PNLF) distances, except
        NGC 300, have been calculated relative to the calibrator, M 31,
        assuming it has D=0.77Mpc, and E(B-V)=0.08.
     b: Adjusted for metallicity by -0.28±0.10mag in distance modulus
        following Ciardullo & Jacoby (1992ApJ...388..268C).
     c: Saha et al. (1995ApJ...438....8S) value, adjusted for the
        Burstein & Heiles (1984ApJS...54...33B) foreground reddening as
        adopted for the PNLF.
 References:
        1: Jacoby et al., 1990, Cat. J/ApJ/365/471
        2: Feast & Walker, 1987ARA&A..25..345F
        3: Welch et al., 1987ApJ...321..162W
        4: Ciardullo et al., 1989, Cat. J/ApJ/339/53
        5: Freedman & Madore, 1990ApJ...365..186F
        6: Freedman et al., 1992ApJ...396...80F
        7: Jacoby et al. 1989, Cat. J/ApJ/344/704
        8: Freedman et al., 1994ApJ...427..628F
        9: Jacoby & Ciardullo 1993IAUS..155..503J
       10: Saha et al., 1995ApJ...438....8S
       11: Jacoby et al. 1990ApJ...356..332J
       12: Pierce et al., 1994Natur.371..385
       13: Freedman et al., 1994Natur.371..757F

History:
    Prepared via OCR at CDS.
(End)                         James Marcout, Patricia Bauer [CDS]    14-Jan-2003