Spectre HIP 827278 étoile de type Be (Luc Caron)

Spectre HIP 827278 étoile de type Be

HIP 87278 fait partie de la constellation d'hercule. Elle est un peu à l'est de Mu Her. C'est une étoile de type Be ce qui veut dire qu'elle a un anneau d'accrétion qui orbite autour. Il est donc possible de détecter des raies d'émission en provenance des bordures de cet anneau et de mesurer sa vitesse par effet doppler. En fait, la partie de l'anneau qui s'éloigne de nous et celle qui se rapproche causeront un dédoublement de la raie d'émission et c'est la différence entre les deux pics qui nous donne une idée de cette vitesse. Sur mon spectre on voit un tel dédoublement pour la raie d'émission Hb ce qui me permet de supposer que la vitesse de rotation de l'anneau d'accrétion est de 60 km/s. Mais je reste prudent dans mes calculs car mon système de spectrométrie n'est pas à haute résolution comme ceux des professionnels et qu'en plus je n'ai pas fait de correction en tenant compte de l'angle du disque d'accrétion par rapport à nous.

HIP 87278 is part of the constellation Hercules. It is a little east of Mu Her. It is a Be type star which means that it has an accretion ring that orbits around it. It is therefore possible to detect emission lines coming from the edges of this ring and to measure its speed using the Doppler effect. In fact, the part of the ring which moves away from us and the part which approaches us will cause a splitting of the emission line and it is the difference between the two peaks which gives us an idea of this speed. On my spectrum we see such a splitting for the Hb emission line which allows me to assume that the rotation speed of the accretion ring is 60 km/s. But I remain cautious in my calculations because my spectrometry system is not high resolution like those of professionals and in addition I have not made a correction taking into account the angle of the accretion disk in relation to ours.

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	n/a
Started	n/a
Astrometry.net job	n/a
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):