Zobrazeno 61 - 70
of 112
pro vyhledávání: '"Navascués, D. Barrado y"'
An analytical model has been developed to empirically study the effects of stellar spots and faculae on the observed equivalent widths of Li {\sc i} 6708, Na {\sc i} 5896 and K {\sc i} 7699 \AA lines (and abundances in the case of lithium) in late-ty
Externí odkaz:
http://arxiv.org/abs/astro-ph/0103419
Autor:
Navascués, D. Barrado y, Stauffer, John R., Briceño, César, Patten, Brian, Hambly, Nigel C., Adams, Joseph D.
We have identified a large sample of probable low mass members of the young open cluster IC2391 based on optical (VRIZ) and Infrared (JHK$_s$) photometry. Our sample includes 50 probable members and 82 possible members, both very low mass stars and b
Externí odkaz:
http://arxiv.org/abs/astro-ph/0011492
We present very deep and accurate photometry of the open cluster M35 (VRIc filters). We have covered a region of 27.5x27.5 square arcmin. The data range from Ic=12.5 to 23.5 mag, and the color intervals are 0.4\le(V-I)c\le3.0, 0.5\le(R-I)c\le2.5. Rou
Externí odkaz:
http://arxiv.org/abs/astro-ph/0011136
We present an analysis of high quality spectra of members of the young cluster M35. By using a multi-fiber spectrograph, we are able to collect high signal-to-noise, high resolution spectra of a sample of photometric candidate members. Accurate radia
Externí odkaz:
http://arxiv.org/abs/astro-ph/0011125
Autor:
Stauffer, J. R., Navascués, D. Barrado y, Bouvier, J., Morrison, H. L., Harding, P., Luhman, K. L., Stanke, T., McCaughrean, M., Terndrup, D. M., Allen, L., Assouad, P.
Publikováno v:
Astrophys.J.527:219-229,1999
We have identified twenty-seven candidate very low mass members of the relatively young Alpha Persei open cluster from a six square degree CCD imaging survey. Based on their I magnitudes and the nominal age and distance to the cluster, these objects
Externí odkaz:
http://arxiv.org/abs/astro-ph/9909207
We have obtained high resolution spectra of $\sim$40 members of M35, determined the Lithium-T$_{\rm{eff}}$ morphology and the distribution of the rotational velocity for G and K stars, and compared them to those of the Pleiades and other well-known o
Externí odkaz:
http://arxiv.org/abs/astro-ph/9907026
We have identified a large number of possible very low mass members of the cluster IC2391 based primarily on their location in an I versus (R-I)_C CM diagram. We have obtained new photometry and low resolution ($\Delta \lambda = 2.7$ \AA) spectroscop
Externí odkaz:
http://arxiv.org/abs/astro-ph/9907027
Publikováno v:
Astrophys.J.522:L53-L56,1999
We have obtained new photometry and intermediate resolution ($\Delta \lambda = 2.7$ \AA\ ) spectra of 19 of these objects (14.9 $\le$ $I_c$ $\le$ 17.5) in order to confirm cluster membership. We identify 15 of our targets as likely cluster members ba
Externí odkaz:
http://arxiv.org/abs/astro-ph/9907007
Autor:
Navascues, D. Barrado y
Publikováno v:
Astron.Astrophys. 339 (1998) 831-839
We have recomputed the kinematic properties of several of dozens nearby stars, to try to verify if Castor has a cohort of stars sharing the same space motion and age. We used kinematics, the location of the stars in CM diagrams, their lithium abundan
Externí odkaz:
http://arxiv.org/abs/astro-ph/9905243
We have reanalyzed data for the proposed moving group associated with beta Pic in order to determine if the group (or part of it) is real, and, if so, to derive an improved age estimate for beta Pic. By using new, more accurate proper motions from PP
Externí odkaz:
http://arxiv.org/abs/astro-ph/9905242