Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Heap, S. R."'
Autor:
Lebouteiller, V., Pequignot, D., Cormier, D., Madden, S., Pakull, M. W., Kunth, D., Galliano, F., Chevance, M., Heap, S. R., Lee, M. -Y., Polles, F. L.
Publikováno v:
A&A 602, A45 (2017)
(abridged) The dominant thermal mechanisms in the neutral interstellar medium, which acts as a star-forming gas reservoir, are uncertain in extremely metal-poor galaxies. Our objective is to identify the heating mechanisms in one such galaxy, IZw18,
Externí odkaz:
http://arxiv.org/abs/1702.07377
Autor:
Williger, G. M., Carswell, R. F., Weymann, R. J., Jenkins, E. B., Sembach, K. R., Tripp, T. M., Davé, R., Haberzettl, L., Heap, S. R.
Publikováno v:
MNRAS, v405, 1736 (2010)
We present an analysis of the Ly-a forest toward 3C 273 from the Space Telescope Imaging Spectrograph at ~7 km/s resolution, along with re-processed data from the Far Ultraviolet Spectroscopic Explorer. The high UV flux of 3C 273 allows us to probe t
Externí odkaz:
http://arxiv.org/abs/1002.3401
Autor:
Williger, G. M., Heap, S. R., Weymann, R. J., Dave, R., Ellingson, E., Carswell, R. F., Tripp, T. M., Jenkins, E. B.
Publikováno v:
Astrophys.J.636:631-653,2006
We present STIS 7km/s resolution data of the Ly-a forest toward PKS0405-123 (z=0.574). We make two samples. The strong sample (60 systems) has column density logNHI>13.3 over 0.00213.1 at 0.020
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505586
Publikováno v:
Astrophys.J. 607 (2004) 451-459
Ultraviolet spectra from the Space Telescope Imaging Spectrograph (STIS) are used to determine terminal velocities for 11 O and B-type giants and supergiants in the Small Magellanic Cloud (SMC) from the Si IV and C IV resonance lines. Using archival
Externí odkaz:
http://arxiv.org/abs/astro-ph/0401399
Autor:
Tripp, T. M., Wakker, B. P., Jenkins, E. B., Bowers, C. W., Danks, A. C., Green, R. F., Heap, S. R., Joseph, C. L., Kaiser, M. E., Linsky, J. L., Woodgate, B. E.
(Abridged) We present a new high-resolution (7 km/s FWHM) echelle spectrum of 3C 351 obtained with STIS. 3C 351 lies behind the low-latitude edge of high-velocity cloud Complex C, and the new spectrum provides accurate measurements of O I, Si II, Al
Externí odkaz:
http://arxiv.org/abs/astro-ph/0302534
Autor:
Bouret, J. -C., Lanz, T., Hillier, D. J., Heap, S. R., Hubeny, I., Lennon, D. J., Smith, L. J., Evans, C. J.
Publikováno v:
Astrophys.J.595:1182-1205,2003
We present the results of a detailed UV and optical spectral analysis of the properties of 6 dwarf O-type stars in the SMC H II region NGC 346. Stellar parameters, chemical abundances, and wind parameters have been determined using NLTE line blankete
Externí odkaz:
http://arxiv.org/abs/astro-ph/0301454
Autor:
Tripp, T. M., Jenkins, E. B., Williger, G. M., Heap, S. R., Bowers, C. W., Danks, A. C., Dave', R., Green, R. F., Gull, T. R., Joseph, C. L., Kaiser, M. E., Lindler, D., Weymann, R. J., Woodgate, B. E.
Publikováno v:
Astrophys.J.575:697-711,2002
Using high S/N STIS echelle spectra (FWHM=7 km/s) of 3C 273, we constrain the metallicities of two Lya clouds in the vicinity of the Virgo cluster. We detect C II, Si II, and Si III absorption lines in the Lya absorber at z = 0.00530. Previous observ
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204204
We present a preliminary study of the metallicity of low-redshift Lyman alpha absorbers from the HST/STIS spectrum of 3C273. Using a pixel-based shift-and-coadd technique, we compare observations to carefully-constructed mock quasar spectra from a co
Externí odkaz:
http://arxiv.org/abs/astro-ph/0109242
We present preliminary results on the low-redshift Lyman alpha forest as based on STIS spectra of 3C 273. A total of 121 intergalactic Lyman alpha-absorbing systems were detected, of which 60 are above the 3.5 sigma completness limit, log N(HI)~12.3.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0109100
Autor:
Brandt, J. C., Heap, S. R., Walter, F. M., Beaver, E. A., Boggess, A., Carpenter, K. G., Ebbets, D. C., Hutchings, J. B., Jura, M., Leckrone, D. S., Linsky, J. L., Maran, S. P., Savage, B. D., Smith, A. M., Trafton, L. M., Weymann, R. J., Norman, D., Redfield, S.
We analyze HST/GHRS spectra of AB Doradus, the prototypical ultra-rapidly rotating K dwarf. We observed chromospheric (Mg II) and transition region (C II, Si IV, C IV, and N V) lines periodically throughout the stellar rotation period, and provide a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0012487