Wolf-Rayet Nebula Reiner Vogel 2012

Transcription

1 Wolf-Rayet Nebula Reiner Vogel 2012

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3 Sh in Canis Major 60x60, blue RGB Dean Salman OIII other name RA dec dia. ' F S B Sh Distance: 575 pc, Size: 5.9 pc, Source: 2003MNRAS B This ring nebula surrounds the Wolf-Rayet star WR 6. Observing notes: 22" f/4.5 01/2011. Fantastic WR bubble, responds extremely well to OIII filter. Shell is most obvious as a crescent NW of o1 CMa, becoming fainter at NW. Brighter patch again at N to NE. At 80x under excellent conditions, the shell can be further followed from this N part down the E side back to o1 CMa, forming a closed bubble around EZ CMa. Only with 7mm exit pupil, the center appears filled and somewhat lighter than the outside of the bubble. This is not visible with 5.5mm exit pupil.

4 7h30m 7h00m Sirius i 6h30m Bochum 4 n3 Murzim n1 n2 NGC ' p M 41 Canis Major x2 o2 o1 x1 29 t Cr ' Markab NGC w Wezen s Adara Aludra ' 10 Furud ' 7h05m 7h00m 6h55m 6h50m 6h45m Canis Major ' o ' o1 Cr '

5 NGC 2359 in Canis Major 60x60, red narrowband, Dean Salman other name RA dec dia. ' F S B Sh NGC2359 = Thor's Helmet Distance: 5000 pc, Size: 32.0 pc, Source: 2001AJ C Nicknamed Thor's Helmet, this nebula (also called NGC 2359) is a wind blown bubble ionized by the Wolf-Rayet star WR 7 (HD 56925). Observing notes: 22" f/4.5 Responds extremely well to OIII filter. Very structured and bright WR nebula with shell, E bar and extensions toward NW and SW

6 -05 00' 8h00m 7h30m 7h00m M 50 a ' NGC q NGC NGC 2423 m ' M 46 M NGC NGC 2360 Muliphen 11 6 Bochum 4 i Sirius n ' p h25m 7h20m 7h15m 7h10m NGC ' 7h30m Haffner ' Haffner 6 NGC ' Basel 11A '

7 G (WR 102) bubble in Sagittarius 30x30 blue other RA Dek comments Observing notes:

8 M24 18h30m 18h00m M 23 17h30m Tr 33 NGC ' m x 14 NGC M 21 NGC 6469 M NGC Cr NGC M o M 28 NGC 6544 q ' l 30'x30' NGC NGC ' d g2 g1 NGC 6451 Cr M 18 NGC 6425 M 69 M 6 NGC 6416 Tr 28 NGC h00m 17h55m 17h50m 17h45m 17h40m 17h35m Terzan 11 Ter ' ' Pal 6 30'x30' ' 3

9 Sh 2-80 in Sagitta 60x60, red POSS blue POSS red composite other name RA dec dia. ' F S B Sh M1-67, WR shell Distance: 6400 pc, Size: 3.7 pc Source: 2000A&A N This is a ring nebula surrounding the Wolf Rayet star WR 124, also known as Merrill's star. Observing notes: 22" f/4.5 08/2008: unsuccessful 06/2010: suspected as a faint glow around WR star with H beta filter 10/2010: at 350x and with H beta filter, a diffuse glow was observed around the WR star. 08/2012: under excellent conditions, at 200 and 350x visible without filter as a very faint shell, small contrast gain with H beta filter.

10 18h30m ' Cr z d Sham 111 b Sagitta e ' Deneb El Okab Deneb El Okab p c 31 w2 w1 o ' Tarazed 18 19h30m 19h00m Pal ' PK PK ' PK ' PK h20m 19h15m 19h10m 19h05m

11 WR 128 in Sagitta 30x30 blue Ha/OIII/mix other RA Dek comments Observing notes: During two observing sessions with my 22" f/4.5 Dob and the 13mm Nagler with OIII filter, a segment in the NE part of the shell was suspected as an extremely faint filament. This corresponds to the brightest part of the shell in the OIII image by Gruendl.

12 +25 00' Vulpecula Stock 1 8 a NGC 6830 NGC M ' h g Cr 399 z M 71 d Harvard 20 30'x30' a 13 b Sagitta e ' r 5 28 f p c 31 w2 w1 20h30m 20h00m 19h30m ' g ' z M 71 M 71 9 d Harvard ' 30'x30' a b ' Sagitta h00m 19h55m 19h50m 19h45m 19h40m

13 WR134 shell in Cygnus other RA Dek comments WR134 shell Wolf-Rayet shell Observing notes: The shell is roughly half ways between the Tulip Nebula, Sharpless 101, and the Crescent Nebula, NGC With my 22" Dob, the WR shell is not or only hardly visible without filter and reacts extremely well to the OIII filter. With filter it appears as a crescent of roughly 15', opened towards east. Its appearance and brightness is similar to that of another WR shell Sharpless 308 in Canis Major, which is, however, considerably larger. This shell is not difficult at all and is also faintly visible with my 8" Dob and OIII filter from my suburban backyard.

14 Äquat. Koord. Apparent h00m32s (CEST) Mag:9.6 Ges.feld:+20 00'00s ' M ' NGC 6871 Biur ' 21h00m 20h30m 20h00m 19h30m ' Äquat. Koord. Apparent h01m02s (CEST) Mag:12.0 Ges.feld:+05 00'00s IC 4996 B ' ' NGC 6883 NGC 6871 Biur ' 20h20m 20h15m 20h10m 20h05m 20h00m

15 NGC 6888 in Cygnus 60x60, blue POSS blue POSS red RGB Dean Salman other name RA dec dia. ' F S B Sh NGC<6888 = Crescent Nebula Distance: 1200 pc, Size: 6.3 pc, Source: 1982ApJS B NGC 6888, the Crescent nebula, is a ring nebula surrounding the Wolf Rayet star WR 136. Observing notes: 22" f/4.5 best response to OIII, but also visible w/o filter. Spectacular WR shell with internal filaments. 08/2012: central bar extends over central star. two patches in SW part, several knots along NW rim. Shell is closed, there is an extrusion on NW side towards star.

16 +45 00' Deneb d x 57 NGC IC 5070 Cygnus 14 n ' Sadr l ' h 8 Gienah Cygni 17 c NGC h00m 20h30m 20h00m 19h30m ' PK vdb ' Berk 86 M 29 PK NGC 6888 Basel ' 34 IC 4996 B145 NGC ' h25m 20h20m 20h15m 20h10m 20h05m 20h00m

17 Sh2-157a diffuse edge E patch, faint Sh in Cep/Cas main filament diffuse W filament, very faint fan shaped cluster both images are rotated, north to the right narrowband Dean Salman other name RA dec dia. ' F S B Sh Distance: 2500 pc, Size: 65.5 pc, Source: 1982ApJS B This is a ring nebula around WR 157, in the Basel 3 (Markarian 50) cluster that is in turn part of Cas OB2. Observing 14" f/5 notes: 08/2005: A very long and relatively bright filament oriented NS is easily visible that responds extremely well to OIII filtering. S157a (bright knot in northern central part) best with H beta 22" f/4.5 11/2011: Main filament N/S oriented is most distinct. Faint patch E of it. Another shorter and weaker filament W of main filament. S part diffuse, consisting of two patches of which the E patch contains 157a.

18 +65 00' 1h00m i 26 Alkurhah 10 k ' l Caph t 2 1 d z 14 r e 22h00m ' s 0h30m 0h00m 23h30m 23h00m 22h30m b ' M ' NGC 7635 Mrk 50 NGC 7510 King ' ' 23h30m 23h15m 23h00m

19 WR 93 and Sh 2-11 in Scorpius 60x60, red POSS blue other name RA dec dia. ' F S B Sh N6357: Distance: 1740 pc, Size: 45.6 pc, Source: 1982ApJS B This is the star formation region W22, also called the War and Peace Nebula or NGC Contains the star cluster Pismis 24 which includes a multiple O4 and O4-5 star system. Near by is the Wolf-Rayet star WR 93, which is also a multiple star system with a class O7-9 companion. At the same distance as the Cat's Paw nebula NGC 6334 and separated from it by a dark cloud. Observing notes: 16" f/4.5 07/09: Only the central part of this large HII region could be observed. With OIII, this part is relatively bright and appears not homogeneous, but distinctly mottled

20 18h00m 17h30m 17h00m 3 43 g ' g2 27 e M ' Scorpius l u NGC 6281 m2 m1 k i2 i ' Tr 24 Cr h35m 17h30m 17h25m 17h20m 17h15m NGC ' Tr ' Cr 333 Pismis ' B '

21 WR127 and Sh 2-92 in Cygnus 60x60, red Dean Salman H alpha other name RA dec dia. ' F S B Sh Distance: 4400 pc, Size: 64.0 pc Source: 1982ApJS B Sh 2-92 is ionised by the Wolf-Rayet star WR 127, a binary star with an O9V companion, at a distance of 3700 parsecs according to one source. Avedisova adds a second ionising star, the O7 Ib supergiant HD and gives a larger distance estimate of /- 100 parsecs. Observing notes: 22" f/4.5 08/2012: Observed with 32mm, UHC better than H beta. Extremely faint glow, dark side towards SW. Difficult to distinguish from the star field with filter.

22 +35 00' 35 SH2-101 h 19h00m c SH l SH2-98 SH ' 41 SH2-97 f 21 Roslund 4 SH SH 'x60' b2 b ' Vulpecula NGC 6882 NGC SH SH2-88 SH Stock 1 8 a 3 SH M 27 SH2-86 NGC NGC h30m 20h00m 19h30m ' SH2-91 NGC SH NGC 6842 NGC ' SH ' 60'x60' SH2-93 NGC ' SH2-90 Sh2-90 NGC 6815 SH h55m 19h50m 19h45m 19h40m

23 WR 153/152 and Sh in Cepheus 60x60, red narrowband Dean Salman other name RA dec dia. ' F S B Sh Distance: 3180 pc, Size: 83.3 pc, Source: 1978A&A H This giant HII region in the Cepheus OB1 association is ionised by two WR stars and several OB stars. HD (WR 153) and an O 8.5 star lie near the middle of the radio shell associated with this nebula. Observing notes: 14" f/5 Observed several times with OIII filter, very large faint nebula, round dark structure to the E. There is a very large extension to the SW well beyond the DSS frame with distinct OIII emission which increases the size of the nebula to around 1.5.

24 Alderamin 21h00m ' 12 n 2 1 l Garnet Star d z 14 Tr 37 IC ' e 13 b ' 23h30m 9 Azelfafage a 4 p2 23h00m 22h30m M 39 22h00m 21h30m ' 22h00m PK NGC ' e ' PK Berk 94 NGC ' PK h35m 22h30m 22h25m 22h20m 22h15m NGC h10m 22h05m

25 Sh in Cassiopeia 60x60, blue POSS blue POSS red composite other name RA dec dia. ' F S B Sh NGC7635 = Bubble Nebula Distance: 3813 pc, Size: 5.8 pc, Source: 2003A&A P This is the Bubble nebula, NGC 7635, a circular shell around the O6.5 IIIf star BD A recent study finds the distance to Sh to be 2500 parsecs, more in line with its assumed position in the Cas OB2 association. Observing notes: 22" f/4.5 10/2007: With OIII filter, the central part of the EN around the star is relatively easy. A fainter, diffuse halo extends to the N. The bubble itself could be traced at least for a 90 arc E of the star.

26 1h00m o 22h00m ' i 26 Alkurhah k ' 6 4 l Caph t 2 1 d z e r ' s 0h30m 0h00m 23h30m 23h00m 22h30m ' 23h45m 23h00m ' M ' NGC 7635 Mrk 50 NGC 7510 King ' 1 23h30m 23h15m