Chromospheric active stars: a key program for amateurs

[Alexandre Santerne]

Thanks Olivier for the image.

In order to evaluate how to develop the Sindex pipeline and building a kind of DB, Christian, Olivier, others, could you please send me an example of your 1D extracted and wavelength-calibrated H&K spectrum ?

I will see how I can proceed these spectra coherently to measure the Sindex.

Thanks.
My email: Alexandre.santerne@lam.fr

Cheers,
Alex

[Peter Somogyi]

Hello Alexandre,

I've sent you 2 nights (2019.05.10, 05.17 + RS CVn: also on 2019.04.19) of 4 program stars (RS CVn = HD 114519, HD115404, Ksi Boo = HD 131156, Sig CrB = HD 146361).
Out of these 4 targets, RS CVn is showing an always different profile - like shooting different stars:

For the other stars, I cannot see much change (continuum slope varies somewhat - should be the choice and manual handling of reference star).
I am suprised to see the S-index being used for RS CVn - browsing through the articles for RS CVn referred to by Simbad (at least 3 I could find), the CaII + Heps emissions are measured in either EWs or fluxes (with different continuum subtraction techniques - either approximated or using a real or reconstruced templace star).
Hope we can continue the exploration and learn further!

Cheers,
Peter

[Dubreuil Pierre]

Bonsoir

Actuellement en mission NP sur le C2PU Calern, nous profitons aussi du T400 amateur pour utiliser UVEX(3) .
actuellement avec reseau 1200 et fente 25microns.

Ci-dessous comparaison d'un spectre T400 et une précédente acquisition avec C8.

a suivre

Pierre et Bertrand

[David Antao]

Bonjour à tous,

Quelques infos utiles sur la liste de cibles à observer :




constellation AD DEC Mag en B type spectral Vr Info
HD 166 Pegase 00 06 36.78 + 29 01 17.41 6.88 G8 D -6.59 Variable of BY Dra type
HD 20630 Baleine-Taureau 03 19 21.70 + 03 22 12.72 5.52 G5V B 18.8 Variable of BY Dra type
HD 22468 Taureau-Baleine 03 36 47.29 + 00 35 15.94 6.63 K2:Vnk C -15.3 Variable of RS CVn type
HD 37394 Cocher 05 41 20.34 + 53 28 51.81 7.07 K1 D 1,32 Variable of BY Dra type
HD 41593 Orion 06 06 40.48 + 15 32 31.57 7.57 K0V E -9,89 Variable of BY Dra type
HD 114519 Chien de chasse 13 10 36.91 + 35 56 05.59 8.51 F6IV + G8IV C  -13.62 Binaire à éclipses de type Algol
HD 115404 Chevelure de berenices 13 16 51.05 + 17 01 01.84 7.69  K2V C 7.67 Étoile à mouvement propre élevé
HD 131156 Bouvier 14 51 23.38 + 19 06 01.70 5.37 G7Ve+K5Ve C 1.59 Variable of BY Dra type
HD 146361 Couronne Boréale 16 14 40.86 + 33 51 30.95 5.64 F6V+G0V C -14.69 Variable of RS CVn type
HD 200391 Renard 21 02 25.91 + 27 48 26.44 7.93 G0V+G5V C -24.6 Herbig Ae/Be star
HD 210334 Lezard 22 08 40.82 + 45 44 32.11 6.83 K0IVe+G5IV C -33.84 Variable of RS CVn type
HD 220140 Cephée 23 19 26.64 +79 00 12.67 8.43 G9V E -16.8 Variable of RS CVn type
HD 224085 Pegase 23 55 04.05 + 28 38 01.25 8.20 K2+IVeFe-1 C -20.5 Variable of RS CVn type

A bientôt
David

[Dubreuil Pierre]

Bonjour à tous

Samedi soir, avant de lancer une série Rr_Lyr j'ai pointé le C8 sur HD 146361.

La prochaine fois je poserai plus longtemps.

region UV H & K

_hd146361_20190907_829_Pierre Dubreuil.png (7.45 KiB) Viewed 4284 times

ZOOM sur la région H & K

HD146361 zoom H & K.png (7.04 KiB) Viewed 4286 times

A suivre

Pierre

[Christian Buil]

Pas mal du tout pour une étoile de magnitude V=5,5 avec un C8 ! Belle mise en évidence de l'émission.

Christian

[Benjamin Mauclaire]

Salut,

A combien estimes-tu l'amplitude de l'emission ?
A combien estimes-tu l'amplitude du bruit du continuum proche ?

Benji

[Dubreuil Pierre]

Bonjour à tous

Quelques détails dans H et K pour HD 210334 avec UVEX G1200 slit 25µ

HD 210334 région H & K

HD 210334 chromospherique UV 1200.png (135.49 KiB) Viewed 4201 times

zone H & K

HD 210334 Zoom UV 1200.png (94.56 KiB) Viewed 4201 times

Le SNR est semble-t-il OK mais je ne sais pas l'estimer ! comment faire sous ISIS ?

Pierre

[Kevin Gurney]

Hi there

My interest was piqued by this project so I tried a few targets....

sig Crb (HD 146361), Xi Boo (HD 131156) and Chi Dra.

My first post here, and not sure how to supply images (FAQ says they have to be on a public server...? Agh - I see you can attach and place inline)

I used two calibration lines (3948.979A, and 4044.418A) in the Lhires Neon lamp which are due to traces of Argon I believe (I hadn't changed to the Argon/neon lamp). I reverse engineered them from the spectral features, and the NIST database.

If I follow this further, I'll change the lamp!

I used a C11 with Atik460EX. Location is suburban area.

Xi Boo 21 April

Xi_Boo_21_April_KG.png (87.97 KiB) Viewed 2081 times

Chi Dra 6 May

Chi_Dra_6_May_KG.png (79.66 KiB) Viewed 2081 times

sig Crb 22 April

sig_crb_22_April_KG.png (67.88 KiB) Viewed 2081 times

best regards

Kevin

[Christian Buil]

Hi Kevin, excellent H&K spectra. I suspect you use a Lhires III 2400 l/mm + 23 microns slit. It's OK ?
(not easy to calibrate, fine use of faint argon lines)

Christian