VdBH 7 and 4 (Claudio Tenreiro)

Celestial hemisphere: Southern · Constellation: Puppis (Pup) · Contains: HD67888 · HD67904 · HD68030 · HD68301 · HD68416 · HD68474 · HD68653 · HD68678 · HD68693 · HD68845 · HD68862 · HD68887 · HD68982 · HD68983 · HD69067 · HD69083 · HD69209 · HD69210 · HD69252 · PGC 3085166

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VdBH 7 and 4

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VdBH 7 and 4

I found nice the objects that are stars embedded in nebulosity, and they were catalogued by van den Berg and William Herbst, for the southern hemisphere. In this case VdBH 7 and 4 are shown, the first one is a type II, the star is near the border of the nebulosity, and the second one is type II, the star is at the center. VdBH7 is the larger of its kind. Also I uploaded the negative image, so it can be compared to the original image from the van den Berg and Herbst work (TheAstronJourn 80(1975)255).
The image analysis is not great, there are a few issues with the larger stars and, maybe with colour calibration. Anyway, both nebulosity are blue, that is correct. In a second analysis I may try to
de-emphasize the stars from the background, the result can be seen as revision E.
VdBH7 is quite obvious, having the star HD68982 as the main player, VdBH4 is fainter, close to the bottom left corner, and plate solving did not identify the central star, but is the star CD-38 4128.

Final
Original
C
D
E

C

Title: VdBH4

Description: Negative image of the small vdBH4

Uploaded: ...

D

Title: VdBH7

Description: Negative image of the VdBH7

Uploaded: ...

E

Title: De-emphasizing the background stars.

Description: I did a crop on the two main objects and de-emphasize the background stars, also another stretch, slowly to avoid some artifacts.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	6975492
PixInsight job	H71XNWPYKPAU6JAWQLXTAMZV7DQ2M8C6
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	08h12m00s.98
RA (top/left)	08h15m28s.20
RA (top/right)	08h08m26s.19
RA (bottom/right)	08h08m29s.60
RA (bottom/left)	08h15m40s.21

Dec (center)	-38°24′22″.6
Dec (top/left)	-37°36′49″.1
Dec (top/right)	-37°38′05″.8
Dec (bottom/right)	-39°11′33″.0
Dec (bottom/left)	-39°10′11″.6

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VdBH 7 and 4

VdBH 7 and 4

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VdBH 7 and 4

VdBH 7 and 4

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