Stasinska, G., Morisset, C., Tovmassian, G., Rauch, T., Richer, M. G., Pena, M., ...
The planetary nebula TS 01 (also called PN G 135.9+55.9 or SBS 1150+599A), with its record-holding low oxygen abundance and its double degenerate close binary core (period 3.9 h), is an exceptional...
Bode, M. F., Darnley, M. J., Harman, D. J., Newsam, A. M., O'Brien, T. J., ...
We report Hubble Space Telescope imaging, obtained 155 and 449 days after the 2006 outburst of the recurrent nova RS Ophiuchi, together with ground-based spectroscopic observations, obtained from the...
What can we learn about the kinematics of bright extragalactic planetary nebulae (2009)
Richer, M. G., Lopez, J. A., Riesgo, H., Garcia-Diaz, Ma. T.
We present high resolution spectroscopy in the [\ion{O}{3}]$\lambda$5007 and H$\alpha$ lines of bright planetary nebulae in the Milky Way bulge and the dwarf galaxies M32, Fornax, Sagittarius, and...
The outflows and 3D structure of NGC 6337, a planetary nebula with a close binary nucleus (2009)
García-Díaz, Ma. T., Clark, D. M., López, J. A., Steffen, W., Richer, M. G.
NGC 6337 is a member of the rare group of planetary nebulae where a close binary nucleus has been identified. The nebula's morphology and emission line profiles are both unusual, particularly the...
NLTE Model of NGC 6543's Central Star and its Relation with the Surrounding Planetary Nebula (2008)
Georgiev, L. N., Peimbert, M., Hillier, D. J., Richer, M. G., Arrieta, A., Peimbert, A.
We analyze the chemical composition of the central star of the planetary nebula NGC 6543 based upon a detailed NLTE model of its stellar wind. The logarithmic abundances by number are H=12.00,...
Garcia-Diaz, M. T., López, J. A., Garcia-Segura, G., Richer, M. G., Steffen, W.
The central star of this nebula has an observed intense magnetic field and the fast wind is no longer present, indicating that a back flow process has probably developed. Long-slit, spatially...
Recycling Matter in the Universe. X-ray observations of SBS 1150+599A (PN G135.9+55.9). (2008)
Tovmassian, G.H., Tomsick, J., Napiwotzki, R., Yungelson, L., Pena, M., Stasińska, G, ...
Original paper can be found at: http://proceedings.aip.org/proceedings/ Copyright AIP DOI: 10.1063/1.2840455
On the Evolved Nature of CK Vul. (2008)
Hajduk, M., Zilstra, A.A., Lopez, J.A., Drew, J.E., Evans, A., ...
Original paper can be found at: http://www.astrosociety.org/pubs/cs/381.html Copyright ASP
Optical line profiles of the Helix planetary nebula (NGC 7293) to large radii (2007)
Meaburn, J., López, J. A., Richer, M. G.
New, very long (25'), cuts of spatially resolved profiles of the Halpha and [N II] optical emission lines have been obtained over the face of the Helix planetary nebula, NGC 7293. These directions...
Revista Mexicana de Astronoma y Astrofsica, 39, 17-34 (2003) (2007)
Optical Line Profile, M. G. Richer, L. Georgiev
We present high-resolution spectroscopic observations of the massive X-ray binary system LS I +65010 (2S 0114+650) in the optical wavelength region. A correlation between equivalent width and radial...
The enigma of the oldest `nova': the central star and nebula of CK Vul (2007)
Hajduk, M., Zijlstra, Albert A., Lopez, J. A., Drew, J. E., Evans, A., ...
CK Vul is classified as, amongst others, the slowest known nova, a hibernating nova, or a very late thermal pulse object. Following its eruption in AD 1670, the star remained visible for 2 years. A...
Chemical Properties of Star Forming Dwarf Galaxies (2007)
Vaduvescu, O., McCall, M. L., Richer, M. G.
Recent studies of the near-infrared (NIR) properties of dwarf irregular galaxies (dIs) and blue compact dwarfs (BCDs) have provided improved estimates for the NIR luminosity of old stellar...
The enigma of the oldest nova : the central star and nebula of CK Vul. (2007)
Hajduk, M., Zijlstra, A.A., Lopez, J.A., Drew, J.E., Evans, A., ...
Using the VLT to analyze the compact photoionized regions in NGC 3109 (2007)
G. Stasinska, M. G. Richer, M. Peña
From ESO VLT on-band o-band" imaging of the dwarf irregular - late type spiral NGC3109, we have detected 20 planetary nebula (PN) candidates and many compact HII regions all over the galaxy. PN...
A catalog of planetary nebula candidates and HII regions in NGC 3109 (2006)
Pena, M., Richer, M. G., Stasinska, G.
Images obtained with the ESO VLT and FORS1 in [O III] 5007 on- and off-band as well as r_Gunn filters are analyzed to search for Planetary Nebula (PN) candidates in the dwarf irregular NGC 3109. In...
The X-ray binary 2S0114+650=LSI+65 010:A slow pulsar or tidally-induced pulsations? (2006)
Koenigsberger, G., Georgiev, L., Moreno, E., Richer, M. G., Canalizo, O. Toledano G., Arrieta, A.
The X-ray source 2S0114+650=LSI+65 010 is a binary system containing a B-type primary and a low mass companion believed to be a neutron star. The system has three reported periodicities: the orbital...
G. Koenigsberger, G. Canalizo, L. Georgiev, A. Arrieta, M. G. Richer
Optical Line Profile Variability of the B1+Neutron Star Binary System LS I+65010 (2S 0114+650)
Infrared Properties of Star Forming Dwarf Galaxies: Blue Compact Dwarfs in the Virgo Cluster (2005)
Vaduvescu, O., Richer, M. G., McCall, M. L.
A sample of 16 blue compact dwarf galaxies (BCDs) in the Virgo Cluster has been imaged in the near-infrared (NIR) in $J$ and $K_s$ on the 2.1m telescope at OAN-SPM in Mexico. Isophotes as faint as...
On the most metal-poor PN and its binary central star (2005)
Napiwotzki, R., Tovmassian, G., Richer, M. G., Stasinska, G., Pena, M., Drechsel, H., ...
PN G135.9+55.9 is the most metal-poor PN known in our Galaxy. The central star resides in a short-period binary system with a compact component, probably a white dwarf. We describe new observations,...
The kinematics of the large western knot in the halo of the young planetary nebula NGC 6543 (2005)
Mitchell, Deborah L., Bryce, M., Meaburn, J., Lopez, J. A., Redman, M. P., Harman, D., ...
A detailed analysis is presented of the dominant ionised knot in the halo of the planetary nebula NGC 6543. Observations were made at high spectral and spatial resolution of the [OIII] 5007 line...
A Close Binary Nucleus in the MOST Oxygen-Poor Planetary Nebula PN G135.9 55.9 (2004)
Tovmassian, G.H., Napiwotzki, R., Richer, M.G., Stasinska, G., Fullerton, A.W., Rauch, T.
A close binary nucleus in the most oxygen-poor planetary nebula PN G 135.9+55.9 (2004)
Tovmassian, G. H., Napiwotzki, R., Richer, M. G., Stasinska, G., Fullerton, A. W., Rauch, T.
We report FUSE and new deep optical spectroscopic observations of PN G 135.9+55.9, the most oxygen-poor planetary nebula located in the Galactic halo. These observations allow us to estimate the...
The kinematics of the most oxygen-poor planetary nebula PN G135.9+55.9 (2003)
Richer, M. G., Lopez, J. A., Steffen, W., Tovmassian, G., Stasinska, G., Echevarria, J.
PN G135.9+55.9 is a compact, high excitation nebula that has been identified recently as the most oxygen-poor halo planetary nebula. Given its very peculiar characteristics and potential implications...
Arrieta , A., Canalizo , G., Georgiev , L., Koenigsberger , G., Richer , M. G.
We present high-resolution spectroscopic observations of the massive X-ray binary system LS I +65 010 (2S 0114+650) in the optical wavelength region. A correlation between equivalent width and radial...
Is HCG31 undergoing a merger or a fly-by interaction? (2002)
Richer, M. G., Georgiev, L., Rosado, M., Bullejos, A., Valdez-Gutierrez, M., Dultzin-Hacyan, D.
We present Fabry-Perot and multi-object spectroscopy of the galaxies in Hickson compact group 31 (HCG31). Based upon our H$\alpha$ data cubes, galaxies A and C are a single entity, showing no...
The alpha-element abundances in the most oxygen-poor planetary nebula PN G 135.9+55.9 (2002)
Richer, M. G., Tovmassian, G. H., Stasinska, G., Jameson, R. F., Dobbie, P. D., Veillet, C., ...
We present extensive new spectroscopy and imaging of PN G 135.9+55.9. We use these data as constraints to photoionization models to derive limits on the oxygen abundance. We find that PN G 135.9+55.9...
Revista Mexicana de Astronoma y Astrofsica, 39, 17--34 (2003) (2002)
Optical Line Profile, G. Koenigsberger, G. Canalizo, A. Arrieta, M. G. Richer, L. Georgiev
We present high-resolution spectroscopic observations of the massive X-ray binary system LS I +65 010 (2S 0114+650) in the optical wavelength region. A correlation between equivalent width and radial...
IC 10: More evidence that it is a blue compact dwarf (2001)
Richer, M. G., Bullejos, A., Borissova, J., McCall, Marshall L., Lee, Henry, Kurtev, R., ...
We present optical spectroscopy of H {\sc ii} regions in the Local Group galaxy IC 10 and $UBVR$ photometry of foreground stars in three fields towards this galaxy. From these data, we find that the...