Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Knauth, David C."'
Publikováno v:
Astrophys.J.706:614-622,2009
We present observations of interstellar rubidium toward o Per, zeta Per, AE Aur, HD 147889, chi Oph, zeta Oph, and 20 Aql. Theory suggests that stable 85Rb and long-lived 87Rb are produced predominantly by high-mass stars, through a combination of th
Externí odkaz:
http://arxiv.org/abs/0910.2288
Publikováno v:
Astrophys.J.647:L115-L118,2006
Sensitive measurements of the interstellar gas-phase oxygen abundance have revealed a slight oxygen deficiency ($\sim$ 15%) toward stars within 500 pc of the Sun as compared to more distant sightlines. Recent $FUSE$ observations of the interstellar g
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607146
Publikováno v:
Astrophys.J. 603 (2004) L105-L108
The isotope ratio, 85Rb/87Rb, places constraints on models of the nucleosynthesis of heavy elements, but there is no precise determination of the ratio for material beyond the Solar System. We report the first measurement of the interstellar Rb isoto
Externí odkaz:
http://arxiv.org/abs/astro-ph/0401601
Publikováno v:
Astrophys.J. 596 (2003) 51-54
We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph observations of the weak interstellar N I doublet at 1160 Angstroms toward 17 high-density sight lines [N(Htot)>=10^21 cm^-2]. When combined with publis
Externí odkaz:
http://arxiv.org/abs/astro-ph/0310372
Autor:
Knauth, David C., Howk, J. Christopher, Sembach, Kenneth R., Lauroesch, James T., Meyer, David M.
Publikováno v:
Astrophys.J. 592 (2003) 964-974
We present Far Ultraviolet Spectroscopic Explorer and Space Telescope Imaging Spectrograph observations of high-ionization interstellar absorption toward HD 14434 [(l, b) = (135.1, -3.8); d ~ 2.3 kpc], an O5.5 V star in the Perseus OB1 Association. I
Externí odkaz:
http://arxiv.org/abs/astro-ph/0304196
Autor:
Hoopes, Charles G., Sembach, Kenneth R., Hebrard, Guillaume, Moos, H. Warren, Knauth, David C.
Publikováno v:
Astrophys.J. 586 (2003) 1094-1110
We have carried out an investigation of the abundance of deuterium along two extended sight lines through the interstellar medium (ISM) of the Galactic disk. The data include Far Ultraviolet Spectroscopic Explorer (FUSE) observations of HD 195965 (B1
Externí odkaz:
http://arxiv.org/abs/astro-ph/0212303
Publikováno v:
Astrophys.J. 586 (2003) 268-285; Erratum-ibid. 594 (2003) 664
In an effort to probe the extent of variations in the interstellar ^7Li/^6Li ratio seen previously, ultra-high-resolution (R ~ 360,000), high signal-to-noise spectra of stars in the Perseus OB2 and Scorpius OB2 Associations were obtained. These measu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0212233
Publikováno v:
Astrophys.J.Suppl. 135 (2001) 201-226
High resolution optical spectra of HD 37903 and HD 147009, which illuminate the reflection nebulae, NGC 2023 and vdB 102, were obtained for comparison with our results for HD 200775 and NGC 7023. Ground-based measurements of the molecules, CH, C$_2$,
Externí odkaz:
http://arxiv.org/abs/astro-ph/0103151
Publikováno v:
Astrophys.J.Suppl. 134 (2001) 133-138
Band oscillator strengths for electronic transitions in CO were obtained at the Synchrotron Radiation Center of the University of Wisconsin-Madison. Our focus was on transitions that are observed in interstellar spectra with the Far Ultraviolet Spect
Externí odkaz:
http://arxiv.org/abs/astro-ph/0101027
As a part of a study on the variation in the 7Li/6Li ratio, high signal to noise, high resolution spectroscopy of Li I (6708 Angstroms) and K I (4044 Angstroms) were obtained toward zeta and o Per. The lithium isotope shift is approximately the same
Externí odkaz:
http://arxiv.org/abs/astro-ph/0004315