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#spectroscopy

4 posts4 participants1 post today
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Lives in Chemistry

🎁Harald Günther turns 90 today—happy birthday! Generations of students used his textbook “#NMR #Spectroscopy—Basic Principles, Concepts and Applications in Chemistry” the most recent edition of which was published by Wiley-VCH in 2013. It first appeared in 1973 and later in several languages. An early PhD student of Günther was Klaus Müllen whose autobiography “The Chemistry Got to be Right” l-i-c.org/1139 will appear in August as volume 15 of the “Lives in Chemistry” series.

Harald Günther · ©2023 Universität Siegen
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TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

A star with a weird color - Nova Lupi 2025 (V462 Lupi)

1st photo is not annotated. Can you find the nova?

2nd photo is annotated.

3rd photo was deliberately mis-focused so that stars were larger disks instead of small points. This makes it easier to see the color.

Note that there are plenty of orange stars and plenty of blue stars...but the nova has a unique color. To my eye it's a pale purple.

Why does the nova have a weird color?

4th image was taken from facebook.com/photo/?fbid=17712 it's a spectrum of the nova. Most stars have a blackbody radiation distribution, but novae (that's the Latin form, plural) have strong emission lines at discrete colors. That can make a weird color compared to most stars.

Image taken with a camera on a fixed tripod.

en.wikipedia.org/wiki/V462_Lup

https://en.wikipedia.org/wiki/V462_Lupi
https://en.wikipedia.org/wiki/V462_Lupi
Camera intentionally mis-focused. The nova has a unique color compared to all the other stars in the frame. See the 4th image to see the nova's spectrum.
Spectrum of the nova. https://www.facebook.com/photo/?fbid=1771205990440705&set=pcb.10056320127790102
#Nova#Photography#Astrophotography
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Bose-Einstein-Kondensat

: -based multi-channel time-tagging module () for democratising single-photon (SP) :

-parallel multiple event tagging precision: 30 ps
-multiple synchronisation event precision: 4 ns
-requires
-cost ~$3000

Article: doi.org/10.1038/s41467-022-350
Web: brighteyes-ttm.readthedocs.io/
GitHub: github.com/VicidominiLab/Brigh

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Bose-Einstein-Kondensat

An , low-cost multinuclear operating in the mT field regime:

-high spectral resolution
-arbitrary pulse programming
-requires
-cost: k$ 20 (mainly PXI waveform generator & digitizer alone)
-cost could be driven down by half using a home-built RF amplifier made with high-power operational amplifiers

paper: doi.org/10.1016/j.jmr.2021.107

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Salamander

Near-infrared spectroscopy as a diagnostic screening tool for lethal chytrid fungus in eastern newts

mander.xyz/post/31884180

mander.xyzNear-infrared spectroscopy as a diagnostic screening tool for lethal chytrid fungus in eastern newts - ManderThis article is from earlier in the year but I missed until now! >Abstract > >The emergence of Batrachochytrium salamandrivorans (Bsal) poses an imminent threat to caudate biodiversity worldwide, particularly through anthropogenic-mediated means such as the pet trade. Bsal is a fungal panzootic that has yet to reach the Americas, Africa, and Australia, presenting a significant biosecurity risk to naïve amphibian populations lacking the innate immune defenses necessary for combating invasive pathogens. We explored the capability of near-infrared spectroscopy (NIRS) coupled with predictive modeling as a rapid, non-invasive Bsal screening tool in live caudates. Using eastern newts (Notopthalmus viridescens) as a model species, NIR spectra were collected in tandem with dermal swabs used for confirmatory qPCR analysis. We identified that spectral profiles differed significantly by physical location (chin, cloaca, tail, and foot) as well as by Bsal pathogen status (control vs. exposed individuals; p < 0.05). The support vector machine algorithm achieved a mean classification accuracy of 80% and a sensitivity of 92% for discriminating Bsal-control (-) from Bsal-exposed (+) individuals. This approach offers a promising method for identifying Bsal-compromised populations, potentially aiding in early detection and mitigation efforts alongside existing techniques.
#spectroscopy
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In the Dark

Weekly Update from the Open Journal of Astrophysics – 07/06/2025

It’s Saturday so once again it’s time for the weekly update of papers published at the Open Journal of Astrophysics. Since the last update we have published two new papers, which brings the number in Volume 8 (2025) up to 69 and the total so far published by OJAp  is now up to 304.

The two papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.

The first paper to report is “Chemical Abundances in the Leiptr Stellar Stream: A Disrupted Ultra-faint Dwarf Galaxy?” by Kaia R. Atzberger (Ohio State University) and 13 others based in the USA, Germany, the UK, Sweden, Australia, Canada and Brazil. This one was published on 2nd June 2025 and is in the folder marked Astrophysics of Galaxies. It presents a spectroscopic study of stars in a stellar stream suggesting that the stream originated by the accretion of a dwarf galaxy by the Milky Way.

The overlay is here:

 

You can read the final accepted version on arXiv here.

The second paper is “Scaling Laws for Emulation of Stellar Spectra” by Tomasz Różański (Australian Nastional University) and Yuan-Sen Ting (Ohio State University, USA). This was published yesterday, i.e. on 6th June 2025, and is in the folder Instrumentation and Methods for Astrophysics. The paper discusses certain scaling models and their use to achieve optimal performance for neural network emulators in the inference of stellar parameters and element abundances from spectroscopic data.

The overlay is here:

You can find the officially-accepted version of the paper on arXiv here.

That’s the papers for this week. I’ll post another update next weekend.

As a postscript I have a small announcement about our social media. Owing to the imminent demise of Astrodon, we have moved the Mastodon profile of the Open Journal of Astrophysics to a new instance, Fediscience. You can find us here. The old profile currently redirects to the new one, but you might want to update your links as the old server will eventually go offline.

#arXiv241017312v2#arXiv250318617v2#AstrophysicsOfGalaxies
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Jennifer Lynn Bartlett

Total Solar Eclipse of 1869 was a pivotal moment in the devlopment of American "physical astronomy" (now astrophysics). Thank you, Rebecca Charbonneau for your elequont summary of the article I recently published with Tom Hockey.

ww2.aip.org/history/the-total-

Charles Young eclipse spectrum
AIP · May 2, 2025The total solar eclipse of 1869 and American astrophysics
#astronomy#astrophysics#histsci
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