Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/612/447    Draco 119 and HD 88609 equivalent widths     (Fulbright+, 2004)

Draco 119: a remarkable heavy-element-deficient giant. Fulbright J.P., Rich R.M., Castro S. <Astrophys. J., 612, 447-453 (2004)> =2004ApJ...612..447F
ADC_Keywords: Equivalent widths ; Stars, metal-deficient Keywords: galaxies: individual (Draco) - nuclear reactions, nucleosynthesis, abundances - stars: abundances Abstract: We report the abundance analysis of new high signal-to-noise ratio (S/N) spectra of the most metal-poor ([Fe/H]=-2.95) star currently known to be a member of a dwarf galaxy, the Draco dSph red giant D119. No absorption lines for elements heavier than Ni are detected in two Keck HIRES spectra covering the 3850-6655Å wavelength range, a phenomenon not previously noted in any other metal-poor star. We present upper limits for several heavy-element abundances. The most stringent limits, based on the nondetection of SrII and BaII lines, indicate that the total s- and r-process enrichment of D119 is at least 100times smaller than Galactic stars of similar metallicity. The light-element abundances are consistent with the star having formed out of material enriched primarily by massive Type II supernovae (M>20-25M). If this is the case, we are forced to conclude that massive, metal-poor Type II supernovae did not contribute to the r-process in the proto-Draco environment. We compare the abundance pattern observed in D119 to current predictions of prompt enrichment and pair-instability supernovae and find that the model predictions fail by an order of magnitude or more for many elements. Description: The data are obtained using two settings of the HIRES spectrograph on the Keck I telescope, on 2000 July 6 and 2001 June 29. Objects: ----------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------- 17 20 16.1 +57 52 56 Draco 119 = [BS61] 119 10 14 29.0 +53 33 39 HD 88609 ----------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 49 180 Line list
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 F7.2 0.1nm lambda Wavelength 9- 13 A5 --- Ion Ion (1) 17- 20 F4.2 eV EP Excitation potential 25- 30 F6.3 --- log(gf) ? Log of oscillator strength 32 A1 --- f_log(gf) [b] Flag on log(gf) (2) 34 A1 --- l_EW1 Limit on EW1 35- 37 I3 0.1pm EW1 ? Equivalent width for Draco 119 39 A1 --- n_EW1 [abc] Note on EW1 (3) 43- 45 I3 0.1pm EW2 ? Equivalent width for HD88609 47 A1 --- n_EW2 [abc] Note on EW2 (3)
Note (1): CH line analysis assumed a dissociation energy of 3.47eV. Note (2): 'b' indicates lines treated as blends of many hyperfine components. Hyperfine data were taken from Johnson (2002ApJS..139..219J), McWilliam (1998AJ....115.1640M), and McWilliam et al. (1995AJ....109.2757M). Note (3): Values for EW1 and EW2 followed by the same note letter should be taken as blended together.
History: From electronic version of the journal
(End) Marianne Brouty [CDS] 21-Mar-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© Unistra/CNRS