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Origin of diffuse C II 158 micron and Si II 35 micron emission in the Carina nebula
Onaka, T.; Shibai, H.; Mizutani, M.
We present the results of mapping observations with ISO of [O I] 63 µm, 145 µm, [N II] 122 µm, [C II] 158 µm, [Si II] 35 µm, and H_2 9.66 µm line emissions for the Carina nebula, an active star-forming region in the Galactic plane. The observations were made for the central 40 arcmin × 20 arcmin area of the nebu…
On the importance of the few most massive stars: The ionizing cluster of NGC 588
Vílchez, J. M.; González Delgado, R. M.; Cerviño, M. +3 more
We present the results of a double analysis of the ionizing cluster in
Physical interpretation of the NGC 7469 UV/X-ray variability
Maraschi, L.; Nandra, K.; Petrucci, P. O. +1 more
We present a re-analysis of the simultaneous ∼30 day IUE/XTE observation of NGC 7469 done in 1996. Our main progress in this paper, in comparison to previous spectral analyses (Nandra et al. \cite{nan98,nan00}), is to adopt and fit directly to the data a detailed model of the Comptonized spectrum. This firstly allows one to fit simultaneously the …
Molecular and dust features of 29 SiC carbon AGB stars
He, Jinhua; Yang, Xiaohong; Chen, Peisheng
We have reduced and analyzed the Infrared Space Observatory (ISO) Short-Wavelength Spectrometer (SWS) spectra of 29 infrared carbon stars with a silicon carbide feature at 11.30 µm, 17 of which have not been previously published. Absorption or emission features of C2, HCN, C2H2, C3 and silicon carb…
On the Hipparcos parallaxes of O stars
Kaper, L.; Schröder, S. E.; Brown, A. G. A. +1 more
We compare the absolute visual magnitude of the majority of bright O stars in the sky as predicted from their spectral type with the absolute magnitude calculated from their apparent magnitude and the Hipparcos parallax. We find that many stars appear to be much fainter than expected, up to five magnitudes. We find no evidence for a correlation be…
A young binary brown dwarf in the R-CrA star formation region
Demarco, R.; Martín, E. L.; Bouy, H. +5 more
We present imaging and spectroscopic observations with HST (WFPC2, ACS/HRC and STIS), VLT (FORS2) and Keck (HIRES) of the dM 8 ultra-cool dwarf
XMM-Newton spectral and timing analysis of the faint millisecond pulsars PSR J0751+1807 and PSR J1012+5307
Kramer, M.; Webb, N. A.; Barret, D. +3 more
We present XMM-Newton MOS imaging and PN timing data of the faint millisecond pulsars
New membership determination and proper motions of NGC 1817. Parametric and non-parametric approach
Jordi, C.; Balaguer-Núñez, L.; Galadí-Enríquez, D. +1 more
We have calculated proper motions and re-evaluated the membership probabilities of 810 stars in the area of two NGC objects, NGC 1817 and NGC 1807. We have obtained absolute proper motions from 25 plates in the reference system of the Tycho-2 Catalogue. The plates have a maximum epoch difference of 81 years; and they were taken with the double ast…
Axisymmetric dynamical models for SAURON and OASIS observations of NGC3377
Copin, Y.; Emsellem, E.; Cretton, N.
We present a unique set of nested stellar kinematical maps of NGC3377 obtained with the integral-field spectrographs OASIS and SAURON . We then construct general axisymmetric dynamical models for this galaxy, based on the Schwarzschild numerical orbit superposition technique applied to these complementary measurements. We show how these two datase…
Pox 186: An ultracompact galaxy with dominant ionized gas emission
Izotov, Y. I.; Papaderos, P.; Guseva, N. G. +2 more
We present a ground-based optical spectroscopic and HST U, V, I photometric study of the blue compact dwarf (BCD) galaxy Pox 186. It is found that the emission of the low-surface brightness (LSB) component in Pox 186 at radii ⪉3 arcsec (⪉270 pc in linear scale) is mainly gaseous in origin. We detect Hα emission out to radii as large as 6 arcsec. A…