adverbs - Can "here" be an adjective?

• This book here is the one I was talking about.


• My brother here just bought a new car.

The two examples above have here following a noun. Most dictionaries say "here" is an adverb. I am wondering why it is used as an postnominal adjective in these two sentences.

You may explain that "here" is actually "in here". Then it makes sense. "In here", a prepositional phrase, can modify the noun. I would like to hear what you guys think.