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Stellar Classification Anomaly

Author
Mark726
Project Compass Holdings
#1 - 2015-08-01 03:02:02 UTC
While the capsuleer community is undoubtedly distracted by the events of today in Safizon (and rightfully so), I wanted to bring attention to certain information I've discovered over the past few days. As those who know me may know, I've embarked on a long-term project to visit and catalog all of the so-called "shattered" systems that have become available to capsuleers over the past few months. This involves scanning down all signatures in a system, and visiting all celestial objects to see if anything appears out of place or previously unreported, as well as recording basic astrometric data on the local star. It is, as you might imagine, slow going and admittedly dependent on my level of motivation on any particular day. However, I have paid special attention to the so-called "Drifter" wormholes that have appeared recently, and have made an attempt to visit and catalog all of these systems. So far, I've had the chance to visit 4 of 5 (I am thus far only missing J110145, or the Barbican system).

Generally speaking, most of the data I've found in the Drifter systems has been fairly ordinary. In terms of both temperature and estimated age, the stars in Drifter systems appear similar to those of other shattered systems, averaging right around 9900 kelvin and 475,000,000 years, respectively. However, while the stars in J164710 (Vidette), J174618 (Redoubt), and J200727 (Conflux) all appear as turbulent blue subgiant stars, similar to other shattered systems, the spectral class is not quite right. Other shattered systems have a stellar classification of A0IV, indicating that they are slightly hotter, subgiant stars. However, in these 3 systems, the stellar classification is A0IV2 (as an aside, given that these three systems have all appeared as A0IV2, I suspect I simply misrecorded the stellar classification in J055520 (Sentinel), but as my records have that system down as class A0IV and I have not yet had a chance to verify it otherwise, I am keeping J055520 off of this list). I have since confirmed that this is not an error in my ship's spectroscope, but rather some quantifiable difference in the stars themselves. Unfortunately, despite collaboration with some of my colleagues, we've been unable to determine what the '2' in the stellar classification signifies. I have since reached out to CONCORD, the Sisters of Eve, and the Society of Conscious Thought to determine if their scientists have any thoughts on the matter, but I have as of yet heard no reply from any of the organizations.

And so I bring the question to any potential experts in astrophysics amongst the capsuleer community: what does a stellar classification of A0IV2 mean? My own research has yielded no records of a '2' being appended to the end of a stellar classification, but I may well be missing something given my relative unfamiliarity with the topic. Any insights into the matter would be very much appreciated. Of course, if I manage to find my way into J055520 or J110145 (Barbican), or if I hear back from any of my requests, I will update this topic with the relevant information.

Finally, I must thank the members of Signal Cartel for their help in getting me access both into Conflux and Vidette last night, as it would have been quite cumbersome to find my way in without their assistance.
Alexander Kalkoken
Science and Trade Institute
Caldari State
#2 - 2015-08-01 08:04:47 UTC
As someone who has done at least a moderate study of stellar classifications, I may be able to assist you in deciphering that classification.

Commonly, A class stars are main-sequence. This series of star is within normal ranges to be ~9900K, as typical variation is between 7500K to ~10000K, meaning an A0 is pushing the outer end for an A class star and bordering on a B classification. Usually these would be varying between 10500-11500K for a class V main sequence star. Because they are expanded Sub-giants (the IV classification), falling into the A classification is understandable. The 2 classification at the end of it could be due to a particular emission line or peculiar state. Nominally, these would be noted as a p2 or have the emission noted [O III], [N II], [S II]. If it is an emission line, I cannot currently at this time identify it from the data. If, however, it is a peculiar state, a p2 would mean that it is characterized by strong magnetic fields, enhanced abundances of elements such as Si, Cr, Sr and Eu, along with having a slow rotation & falling within the 8000K to 15000K range with abnormally active atmospheric stressors.

Assuming that these stars have been modified to some degree by the Drifters, a p2 classification makes sense due to the constructions around them and the inherent activity we have seen through wormholes. An increased magnetic activity & abnormal atmosphere would lend itself as potentially productive for the purpose of increase stellar activity such as the catastrophic energy use we have witnessed by Drifter ships.
Mark726
Project Compass Holdings
#3 - 2015-08-01 16:50:25 UTC  |  Edited by: Mark726
Thank you for your insights, Mr. Kalkoken. I had found the various stellar peculiarities you described, but not this particular one, and I think your theory best matches the data we have available right now. I'm still seeking out entrances to the Barbican and Sentinel systems, and I look forward to seeing if the classification anomalies hold true.

On another somewhat odd note, I revisited Thera last night, and noticed that the stellar classification there is listed merely as A0, without any attendant I, II, III, IV, or V. I'm still pondering the meaning of this myself, but I thought it was worth noting. I'd be interested if anyone can gain access to a normal shattered system and verify the stellar classifications there.

EDIT: I have since confirmed, as expected, that the Barbican sun is also classified as A0IV2.