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First optical detection from the supernova remnant G 15.1-1.6
P. Boumis, J. Alikakos, P. E. Christopoulou +3
Deep optical CCD images of the supernova remnant G 15.1-1.6 were obtained and filamentary and diffuse emission has been discovered. The images, taken in the emission lines of Halph…
A principal component analysis approach to the morphology of Planetary Nebulae
Stavros Akras, Panayotis Boumis
Principal Component Analysis (PCA) is a well-known technique used to decorrelate a set of vectors. It has been applied to explore the star formation history of galaxies or to deter…
Deep optical observations of the interaction of the SS 433 microquasar jet with the W 50 radio continuum shell
P. Boumis, J. Meaburn, J. Alikakos +6
Four mosaics of deep, continuum-subtracted, CCD images have been obtained over the extensive galactic radio continuum shell, W 50, which surrounds the remarkable stellar system SS…
Abundant dust found in intergalactic space
E. Xilouris, P. Alton, J. Alikakos +3
Galactic dust constitutes approximately half of the elements more massive than helium produced in stellar nucleosynthesis. Notwithstanding the formation of dust grains in the dense…
A deep mosaic of [O III] 5007 A CCD images of the environment of the LBV star P Cygni
P. Boumis, J. Meaburn, M. P. Redman +1
A mosaic of six, deep, CCD images in the light of the [O III] 5007 A nebular emission line has been obtained with the 1.3-m Skinakas (Crete) telescope of the filamentary nebulosity…
The distribution of the ISM in the Milky Way A three-dimensional large-scale model
A. Misiriotis, E. M. Xilouris, J. Papamastorakis +2
We use the COBE/DIRBE (1.2, 2.2, 60, 100, 140, and 240 m) maps and the COBE/FIRAS spectra (for the wavelength range 100 - 1000 m) to constrain a model for the spatial distrib…
New Planerary Nebulae towards the Galactic bulge
P. Boumis, S. Akras, P. A. M. van Hoof +3
New Planetary Nebulae (PNe) were discovered through an [O III] 5007 A emission line survey in the Galactic bulge region with l>0 deg. We detected 240 objects, including 44 new PNe.…
New Planetary Nebulae in the Galactic Bulge region with l>0deg - II
P. Boumis, S. Akras, E. M. Xilouris +4
The presentation of new results from an [O III] 5007 A survey in a search for planetary nebulae (PNe) in the galactic bulge is continued. A total of 60 objects, including 19 new PN…
B and I-band optical micro-variability observations of the BL Lac objects S5 2007+777 and 3C371
E. M. Xilouris, I. E. Papadakis, P. Boumis +5
We have observed S5 2007+777 and 3C371 in the B and I bands for 13 and 8 nights, respectively, during various observing runs in 2001, 2002 and 2004. The observations resulted in al…
Deep optical observations of the supernova remnants G 126.2+1.6, G 59.8+1.2 and G 54.4-0.3
P. Boumis, F. Mavromatakis, E. M. Xilouris +3
Optical CCD imaging and spectroscopic observations of three supernova remnants are presented. Optical emission from G 54.4-0.3 and G 59.8+1.2 is detected for the first time, while…
The creation of the Helix planetary nebula (NGC 7293) by multiple events
J. Meaburn, P. Boumis, J. A. Lopez +4
A deep, continuum-subtracted, image of NGC 7293 has been obtained in the light of the Halpha+[N II] emission lines. New images of two filamentary halo stuctures have been obtained…
The faint supernova remnant G 116.5+1.1 and the detection of a new candidate remnant
F. Mavromatakis, P. Boumis, E. M. Xilouris +2
The extended supernova remnant G 116.5+1.1 was observed in the optical emission lines of Halpha+[N II], [S II] and [O III]; deep long-slit spectra were also obtained. The morpholog…
Multi-band optical micro-variability observations of the BL Lac object S4 0954+658
I. E. Papadakis, V. Samaritakis, P. Boumis +1
We have observed S4 0954+658 in the BVRI bands in 2001, and in the BI bands in 2002. The observations resulted in almost evenly sampled light curves, 3-8 hours long, with an averag…
The kinematics of the bi-lobal supernova remnant G 65.3+5.7 - Paper II
P. Boumis, J. Meaburn, J. A. Lopez +4
Further deep, narrow-band images in the light of [O III] 5007 A have been added to the previous mosaic of the faint galactic supernova remnant G 65.3+5.7. Additionally longslit spa…
Candidates for giant lobes projecting from the LBV stars P Cygni and R 143
J. Meaburn, P. Boumis, M. P. Redman +2
Deep, wide-field, continuum-subtracted, images in the light of the Halpha+[NII] 6548 & 6584 A and [O III] 5007 A nebular emission lines have been obtained of the environment of the…
New Planetary Nebulae in the Northern Galactic Plane
Panayotis Boumis, Myfanwy Bryce
We present deep Halpha+[N II] CCD images of selected new Planetary Nebulae (PNe) discovered through an [O III] 5007 A emission line survey in the Galactic Bulge region with l > 0 d…
Multi-wavelength study of the G 82.2+5.3 supernova remnant
F. Mavromatakis, B. Aschenbach, P. Boumis +1
We present the first CCD flux-calibrated images of the snr G 82.2+5.3 in major optical emission lines. The [O III] 5007 line provides the first direct evidence of optical emission…
The faint supernova remnant G 34.7-0.4 (W44)
Fotis Mavromatakis, Panayotis Boumis, Christos D. Goudis
Flux calibrated images of the known supernova remnant G 34.7-0.4 in basic optical emission lines are presented. The low ionization images show a relatively flat flux distribution.…
Multi-band optical micro-variability observations of BL Lacertae
I. E. Papadakis, P. Boumis, V. Samaritakis +1
We have observed BL Lacertae in the B, R and I bands for 2 nights in July, 1999, and 3 nights in July, 2001. The observations resulted in almost evenly sampled light curves, with a…
New Planetary Nebulae in the Galactic Bulge region with l>0deg - I. Discovery method and first results
Panayotis Boumis, Euthimios V. Paleologou, Fotis Mavromatakis +1
We present the first results of an [O III] 5007 A interference filter survey for Planetary Nebulae (PNe) in the Galactic bulge. Covering (at first) the 66 per cent of the survey ar…
Optical Survey of Planetary Nebulae in the northern Galactic Bulge
Panayotis Boumis, John Papamastorakis
We present preliminary results of an optical survey for Planetary Nebulae (PNe) in the northern part of the Galactic Bulge. In particular, observations at wavelengths corresponding…
First optical light from the supernova remnant G 17.4-2.3
P. Boumis, F. Mavromatakis, E. V. Paleologou
Deep optical CCD images of the supernova remnant G 17.4-2.3 were obtained and faint emission has been discovered. The images, taken in the emission lines of Halpha+[N II], [S II] a…
Imaging and spectroscopy of the faint remnant G 114.3+0.3
F. Mavromatakis, P. Boumis, E. V. Paleologou
We present the first calibrated CCD images of the faint supernova remnant G 114.3+0.3 in the emission lines of [OII], [OIII], Halpha+[NII] and [SII]. The deep low ionization CCD im…
A CCD mosaic of an extended remnant in Cygnus
F. Mavromatakis, P. Boumis, E. V. Paleologou
We present the first CCD mosaic ever produced for the supernova remnant G 65.3+5.7 in [OII] 3727 at a moderate angular resolution. The remnant was observed with the 0.3 m wide-fiel…