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Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  Bow-Tie nebula  ·  NGC 40
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NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB), Marcel Noordman
NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB)
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NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB)

Revision title: Slightly less aggressively processed

Getting plate-solving status, please wait...
NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB), Marcel Noordman
NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB)
Powered byPixInsight

NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB)

Revision title: Slightly less aggressively processed

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Description

Description (from Wikipedia)

NGC 40 (also known as the Bow-Tie Nebula and Caldwell 2) is a planetary nebula discovered by William Herschel on November 25, 1788, and is composed of hot gas around a dying star. The star has ejected its outer layer which has left behind a small, hot star. Radiation from the star causes the shed outer layer to heat to about 10,000 degrees Celsius and become visible as a planetary nebula. The nebula is about one light-year across. About 30,000 years from now, scientists theorize that NGC 40 will fade away, leaving only a white dwarf star approximately the size of Earth.Morphologically, the shape of NGC 40 resembles a barrel with the long axis pointing towards the north-northeast. There are two additional pairs of lobes around the poles, which correspond to additional ejections from the star.The central star of NGC 40 has a Henry Draper Catalogue designation of HD 826. It has a spectral type of [WC8], indicating a spectrum similar to that of a carbon-rich Wolf–Rayet star. The central star has a bolometric luminosity of about 7,000 L☉ and radius of 0.56 R☉. The star appears to have an effective temperature of about71,000 K, but the temperature of the source ionising the nebula is only about45,000 K. One proposed explanation to this contradiction is that the star was previously cooler, but has experienced a late thermal pulse which re-ignited fusion and caused its temperature to increase.

Personal note

The planetary nebula is a bit on the bright side. The reason for this is that I also wanted to tease out the fainter nebulosity around the object, as can be seen on the revision image. At the same time I wanted to retain the checkers structure inside the nebula itself. What has not come out too well because of all this are the two lobes on either side of this bow-tie nebula.

Comments

Revisions

    NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB), Marcel Noordman
    Original
    NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB), Marcel Noordman
    B
  • Final
    NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB), Marcel Noordman
    C

B

Title: Wider field view of the same image

Uploaded: ...

C

Title: Slightly less aggressively processed

Uploaded: ...

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NGC 40 - putting up the red lantern (the Bow Tie Nebula in HO - RGB), Marcel Noordman
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